Caries in Adolescents (Karies Hos Ungdom)

In this study the objective is to establish in depth knowledge about adolescents' oral health characteristics, - practices and - needs. Further, we want to evaluate whether adolescents' caries status can be associated with existing socio-economic inequality, emotional health and lifestyle factors. The main question\[s\] it aims to answer are: 1. What is the caries status (i.e. prevalence, increment at different timepoints and characteristics) among adolescents in Trøndelag? * What is the caries prevalence in different age groups? * Is there any difference in caries prevalence linked to specific age groups, gender or urban versus rural areas? * Are approximal tooth surfaces especially prone to the development of new caries lesions? * Is the caries increment from 12 to 20 years a continuous process or are there high-risk periods within this timespan? * How is the prevalence of enamel caries? Is enamel caries more prevalent in younger age groups than in older age groups? 2. What are the patterns of recall intervals and non-attendance in different age groups, among adolescents in Trøndelag? * What are the attendance rates and prevalence of non-attendance at dental appointments in different age groups? * What is the recall interval between regular follow-up dental visits? * Are there any recall or attendance characteristics linked to age group, gender or urban versus rural areas? 3. What factors (i.e. oral health behaviours, socioeconomic-, lifestyle- and parental factors) are associated with caries among Norwegian adolescents? * How are the oral health behaviours (i.e. dietary- and oral hygiene habits, attendance to dental care) among adolescents, and are there any shared oral health behavioural challenges? * Is the caries prevalence linked to life challenges (mental illness, alcohol/drug use and chronic diseases)? * To what degree are oral health behaviours associated with caries among adolescents? * Is there any association bet