Tooth Problem and its Treatment-seeking Behavior among Older Adults in India

Background: Growing untreated morbidities among the older adults on geriatric issues especially an optimal dental treatment has become an unnished agenda and a long-neglected area for care and management in many low and middle-income countries. There is a continuous rise in the older population in India and at the same time, the rising of co-morbidities or multi-morbidities in the aging population creates catastrophic challenges at the individuals, household, community, and country levels, and therefore, it is important to address dental health problems and related issues in the aged population in India. The present study is an attempt to understand the prevalence of tooth related problems and their health-seeking behavior among the older adults in India. Methods: The present research used data from Building a Knowledge Base on Population Aging in India (BKPAI) which was a national level survey and was conducted in 2011, across seven states of India. The effective sample size of this study was 9541 older adults aged 60+ years. Descriptive statistics and bivariate analysis were used to fulll the study objectives. Additionally, the study employed the Heckprobit selection model which is a two-equation model to understand the determinants of dental health problems. Results: Older adults in the age group of 70-79 years (36.9%) and 80+ years (51.9%) reported higher dental problems compared to 60-69 years (19.9%). Moreover, older women reported more dental problems (29.2%) and also used more dental aids (12.6%) compared to older men. Older adults in the age group 70-79 and 80+ years were 0.15 times and 0.40 times less likely to use dental aids respectively, as compared to 60-69 years older adults. Moreover, older women were 0.28 times more likely to use dental aids than older men. Education and wealth of older adults have a negative relationship with dental problems. Conclusion: This study clearly emphasized that awareness of tooth related problems should be promoted vigorously. Further, a holistic approach is needed to prevent dental diseases that occur because of other co-morbidities. For that, integration of the oral health program with programs dealing with morbidities can act as a solution to the existing problem.

Nations estimation shows that approximately 1200 million people aged 65 years across the world will suffer from oral health care and related problems (2). In case of the older adult population, the untreated oral and tooth problems put more seriousness and hazardous circumstances to them. There is a continuous rise in the older population in India. For instance, the overall aged population rose from 5.6 percent in 1961 to 8.6 percent in the 2011 census and it is also expected to rise to 20 percent in 2050 (6). At the same time, the rising of co-morbidities or multi-morbidities in the aging population creates catastrophic challenges at the individuals, household, community, and country levels (6)(7)(8).
Geriatric morbidities and related disabilities have been continuously witnessing a serious global concern.
In developing countries like India the situation is even more challenging where the high prevalence of chronic diseases and associated disabilities have not been adequately addressed among the older adults and where they also face high inequality in treatment coverage (6,8). Similarly, the lack of oral and tooth health care practices among older adults and its partial or no treatment-seeking-behavior has been seen imperative especially in the Indian context, and that deeply affects the systemic health of aged individuals (9)(10)(11)(12). Further, there is a positive relationship between chronic and infectious diseases with oral health and tooth problems (5). Therefore, it is required to understand the present oral health concerns of the older adults with public health approach in India, where this sub-population-group faces uncaring, low supportive care by own family members, and is entirely dependent on institutions (13).
Furthermore, the most deprived groups (older adults) suffer unprecedented socio-economic, psychological, and uncaring vulnerability in oral health care services. Emerging challenges on this can be burdensome, when this population is associated with a greater prevalence of chronic diseases and disability. Although oral and tooth health problems are more persistent and widespread among older adults and it has become devastating in low and middle-income countries, including India (5, 9-11, 14, 15).Lack of awareness on tooth health and poor health care access, tooth health conspires against the older adults leading to more crucial conditions. Further, deteriorated oral health among older adults may also lead to several risk factors such as frailty conditions, high prevalence of missing teeth, poor bridge, and ill-tting dentures (16)(17)(18). Due to the continuous loss of teeth and ill-tting dentures can produce several other health problems and also reduce a person's quality of life (10,(19)(20)(21). Increasing the risk of tooth decay among the aged population has decreased the enjoyment of food and nutritional quality and quantity (11,(22)(23)(24). The ill-tting dentures among the population can lead to di culty in chewing food and associated disadvantaged (25). In addition, smoking, drinking, and other substance use among older adults are also quite high that causes tooth decaying and other related oral problems (26).
Though it is a preventable disease with proper awareness, education, and management support from the government, however, a lack of adequate health policy intervention by the institutions has led to immense oral health problems among the older adults (15). There is evidence that shows limited and poor oral health care access to the older adults that has put at a risk for other systemic chronic and infectious diseases (3,19). Geriatric health problems, especially oral and tooth-related health care issues are very common and highly persisting amongst disadvantaged and vulnerable groups (27)(28)(29)(30)(31). Poor strata of the community face unprecedented problems in accessing oral health care services and those who reside Page 4/22 in rural areas are further vulnerable. Although it signi cantly varies in the prevalence of tooth loss across different socio-economic groups, age-sex, and rural-urban, however, the high prevalence rate is seen among the male older adults from the poor socio-economic strata (10, 12-14, 28, 30). Tooth-related diseases are a signi cant public health menace having a substantial impact on the quality of life (21,23). Therefore, effective and preventive care management on oral and tooth health needs to be in place by ensuring every individual to quality oral health care at an affordable cost.
There may be several barriers to access to tooth-related services and it is perceived as physical incapacity or disability, travel problems or immobile activity, lack of knowledge of tooth health services, and also non-availability of oral and tooth services in the low resource settings areas (2,13,18,32). Further, lack of family support, caregivers, and social services creates the mismanagement of treatment among the elderly (10,14,33). That produces vast disparities in oral health status and healthcare-seeking behavior across rural-urban (7,9,13,15,18). The living arrangement of the older adults has also made an in uence on oral and tooth health conditions. In this way, the low coverage of oral and tooth care in older adults is evident in high levels of tooth loss, dental caries experience, and the prevalence rates of periodontal disease, xerostomia, and oral precancer/cancer (3,5).Lack of regular check-up, screening, diagnosis, and treatment-related to tooth care services among the older adults that have led to elevated risks for future health and dental caries.
In the low access to oral and tooth care services among the older adult population gives nuance to the policy interventions (15). Further, lack of nancial support, aid, or third party payment make them also low access to oral health care and unaffordable (4,34,35). The high demand for dentures among the older adult population creates a dilemma especially in the lower socio-economic groups' people who cannot afford it. Concerning this, a high variation is seen across rural-urban, gender, and socio-economic groups (3,12,30). However, still, many developing countries are lacking such policies on oral health that can embark on several associated health problems among the older population (2,5,36). Therefore this study relies on, what are the prevailing determinants that in uence in not seeking oral and tooth health care services among the older adults in India. Though very few studies on oral and tooth health problems have been addressed in India, however, still, a dearth of knowledge on aged person's oral and tooth health treatment-seeking behavior and its mechanism has remained in the literature. Therefore, the present study is an attempt to understand the prevalence of tooth related problems and its health-seeking behavior among the older adults in India.

Methods
The present research used data from Building a Knowledge Base on Population Aging in India (BKPAI) which was a national level survey and was conducted in 2011, across seven states of India. The survey was sponsored by the Institute for social and economic change (ISEC), Tata Institute for social sciences (TISS), Institute for economic growth (IEG), and UNFPA, New Delhi. The survey gathered information on various socio-economic and health aspects of ageing among households of those aged 60 years and above. Seven major regionally representative states were selected for the survey with the highest 60 + years population than the national average. This survey was carried out on a representative sample in the northern, western, eastern, and southern parts of India following a random sampling process.
The primary sampling unit (PSU) was villages for rural areas and urban wards in urban areas. The sample of 1280 elderly households was xed for each state. Further details on the sampling procedure, the sample size is available in national and state reports of BKPAI, 2011 (37). For the current study, the effective sample size was of 9541 older adults residing in seven states aged 60 + years were selected.

Outcome variables
There were two outcome variables used in the present study. Both the questions were interrelated to each other. Firstly, whether older adults were having any di culty in teeth (chewing)? The response was coded as 0 "no" and 1 "yes". Secondly, whether older adults use dentures as an aid? The response was coded as 0 "no" and 1 "yes". Here it important to note that only those older adults will be asked for the aid related question who had di culty in chewing due to tooth related problems.

Predictor variables
The explanatory variables were categorized as per the literature cited in the introduction section. Smoking tobacco (no and yes), chewing tobacco (no and yes), alcohol consumption (no and yes), diabetes (no and yes), hypertension (no and yes). Age (60-69, 70-79 and 80+), gender (men and women), marital status (not in a union and currently in a union), education (none, below ve years, 6-10 years and 11 + years), working status (no, yes and retired), economic independence (independent, pension and dependent), living arrangement (alone, with a spouse, with children and others), wealth (poor, middle and rich), religion (Hindu, Muslim, Sikh, and others), caste (scheduled caste/scheduled tribe (SC/ST) and non-SC/ST), residence (rural and urban) and states (Himachal Pradesh, Punjab, West Bengal, Orissa, Maharashtra, Kerala, and Tamil Nadu).

Statistical analysis
Descriptive statistics and bivariate analysis were used to perform preliminary analysis. Additionally, the study employed the Heckprobit selection model which is a two-equation model. First, there is a selection model (in this study, referring to "Do you have any of the di culty in teeth (chewing)? (yes or no)"). Secondly, there is an outcome model with a binary outcome (in this study refers to "Do you use denture as an aid? (yes or no)").The model provides a two-step analysis and deals with the zero-sample issue, based on that, it can also accommodate the heterogeneity (i.e., shared unobserved factors) between older adults and then address the endogeneity (between di culties in teeth (chewing) and opting for denture as an aid ) for older adults in India. The Heckman model is identi ed when the same independent variables in the selection equation appear in the outcome equation. However, this does not provide precise estimates in the outcome equation because of high multicollinearity; it was suggested to have at least one independent variable that appears in the selection equation and not in the outcome equation. A p-value of less than 0.05 was considered statistically signi cant (38).
The heckprobit model is used for sequential questions i.e. where two questions are interrelated in the present case it was tooth related problems and its treatment seeking. Therefore, the outcome variable was in sequence the respondents who had tooth related problems and their treatment seeking behaviour. The similar methods were used in previous studies also (5,7).

Results
The sample distribution of the study population is shown in Table 1. It was found that nearly fteen percent of older adults smoke, 21.6% chewing tobacco, and 7.6% consumed the alcohol. Further, around 10% and 21% of older adults were suffering from diabetes and hypertension respectively. The majority of older adults belonged to 60-69 years age group and 52.6% were women. Half of the older adults were illiterate and more than half of older adults were not working. Nearly, half of the older adult's economic independence was on dependent pension, and in the case of living arrangements, 70.4% of older adults were living with their children. A higher proportion of older adults were Non-SC/ST (74%) and mostly belonged to rural areas (74%).  Table 2. Older adults those who smoke (31.4%), chewing tobacco (29.9%) and consumed alcohol (29.2%) had a higher prevalence of tooth problem. Increasing the age within the elderly population has a positive association with tooth problem. Older adults in the age groups of 70-79 years (36.9%) and 80 + years (51.9%) reported higher tooth problems than 60-69 years (19.9%) age group. However, older adults with the age group of 60-69 years used more tooth aids (13.1%) than other age groups. Interestingly, women reported more tooth problems (29.2%) and also used tooth aids (12.6%) than men. Education and wealth of older adults have a negative relationship with tooth problems.
Moreover, this relationship was reversed for tooth aids of tooth problems. For instance, older adults with no education (33.4%) and belonged to poor categories (29.3%) reported a higher prevalence of tooth problems compared to their counterparts. On the other hand, more educated (22.7%) and rich older adults (24.7%) used more tooth aids for tooth problems. The prevalence of tooth problems was higher among not working (31.7%) older adults compared to working or retired older adults, though, the use of tooth aid was more among retired older adults (23.9%). Tooth problem was more prevalent among SC/ST and rural older adults.   The results from the Heckprobit model for reporting of tooth problem and sequential decision making to use of tooth aids are presented in Table 3. Older adults those who smoke were 0.31 times more likely to suffer from tooth problem than those who did not smoke. In addition, older adults suffering from diabetes and hypertension were 0.14 times and 0.21 times more likely to face tooth problems respectively, compared to their counterparts.  Older adults in the age group 70-79 and 80 + years were 0.15 times and 0.40 times less likely to use tooth aids respectively, than 60-69 years older adults. Moreover, women were 0.28 times more likely to use tooth aids than men. In reference to the illiterate category, older adults with below 5 years of education, 6-10 years, and 11 + years of education were 0.27 times, 0.42 times, and 0.35 times more likely to use tooth aids respectively. In addition, older adults belonged to middle and rich categories were 0.41 times and 0.77 times more likely to use tooth aids compared to poor counterparts.

Discussion
Our research aimed to investigate tooth related problems of older adults and their associated treatmentseeking behavior. The bivariate associations revealed that 28.1% of older adults in India are having tooth disability and 11.5% sought help in that context. The Heckprobit model illustrated the determinants of the use of tooth aids among older adults in India. The results indicated that more women than men use tooth aids. Also, with an increase in educational level and wealth index, the use of tooth aids increased.
Among the three types of substance use, smoking tobacco is found to be positively associated with tooth related problem which causes di culty in chewing. The results were similar to a study by Rohini, Sherlin & Jayaraj, (39). The authors by conducting a descriptive pro-forma-based study on older adult patients in the age group 55-90 years in Chennai, Tamil Nadu, found out that the prevalence of oral habits related lesions was more among patients exposed to tobacco-related products. The study results indicated that any kind of substance use like chewing or smoking tobacco and consumption of alcohol by the older adults to have a determinantal effect on tooth related problems. Though not restricted to the age group of 60 years and above, a study on 16 to 75 years individuals found that consumption of smoking and smokeless tobacco was a risk factor for increased dental cavity and it was higher in smokers as compared to smokeless tobacco chewers (40).
Older adults suffering from morbidities like diabetes and hypertension were found to have more tooth related problems compared to those not reporting the disease. Studies exploring the association of diabetes with dental care emphasized oral health assessment (27,41 Determinants of use of teeth aids among the older adults were gender, age, education, and wealth index. Though we did not nd any studies dealing with the socio-economic and demographic predictors of use of teeth aid among older adults in particular, a study by Mack et al., (29) exploring the same association in the age group 55 to 79 years showed old age, low education, low income, smoking, and alcohol abuse was signi cantly associated with the use of a complete denture. However, our results contradict this and indicate that with a rise in educational level and wealth index, the use of dentures as an aid increase. The probable reasons why individuals with low education and income are less likely to use dentures as an aid range from focusing on basic issues of food, shelter, and cloth to keeping oral health as a less priority issue (43 (36). With an everincreasing 60 plus population in India, this data further necessitates the study on the dental health of the older adults to be taken up in a systematic manner. Although the National Oral Health Program of the Ministry of Health and Family Welfare, Government of India is designed for an affordable, accessible and equitable oral health care to bring about "optimal oral health" for all by 2020, one should not forget that most of the older adults are economically dependent either on pension or on somebody else. This dependence hinders one to take proper dental care. Therefore, we strongly support that the dental policies target the older adults population in general and dependent older adults in speci c.
Generally, oral or dental health is not given the attention it needs. A common practice among people, irrespective of age group is to go for a dental checkup only if there is a toothache. However, the older adults are more vulnerable to tooth loss or oral disease because changes occur with aging (45), hence making it a major concern. For instance, oral and dental health is positively linked to chronic and infectious diseases (5). In a country like India where the older adult population is increasing, lack of adequate data on oral and dental health and hygiene practices is a barrier to achieve good oral and dental health. Infact, one of the study limitations is the non-availability of questions on dental hygiene habits, eating habits, and self-perceived oral health. But, the strength of our study lies in the exploration of the socio-economic and demographic characteristics of older adults with chewing problems and with no teeth aid.

Conclusion
The three major themes of our analysis are, rst, smoking is injurious to one's dental health. Second, morbidities like diabetes and hypertension are key risk factors of teeth disability. Third, adverse socioeconomic conditions prevent the older adults to access tooth aid in the form of using dentures. From the above pieces of evidence, it is clear that awareness of smoking-related health problems should be promoted vigorously. A holistic approach is needed to prevent oral disease to occur because of other morbidities. For that, integration of the oral health program with other programs dealing with morbidities can act as a solution to the existing problem. Though under the National Oral Health Program (45), free dentures are given to older adults above 65 years, still a large number of economically dependent older adults are without any aid. This aspect should be given due attention from the policymakers of the country.

Declarations
Ethics approval and consent to participate: The data is freely available in public domain and survey agencies that conducted the eld survey for the data collection have collected prior consent from the respondent. The local ethics committee of the Institute for Social and Economic Change (ISEC), Bengaluru, ruled that no formal ethics approval was required to carry out research from this data source.

Consent for publication:
Not applicable Availability of data and materials: The study utilizes a secondary source of data that is freely available in the public domain. And, it can be available by a request through http://www.isec.ac.in/prc.html#