Medicine and social sciences are concerned in their own special way with human behavior. The term 'social sciences' is applied to those disciplines which are committed to the scientific examination of human behaviour. These are economics, political science, sociology, social psychology and social anthropology. The term 'behavioural sciences' is applied to the last three, i.e., sociology, social psychology and social anthropology, because they deal directly with human behaviour.

Dental caries is easily diagnosed but there is considerable difficulty in deciding the earliest stage in the progression of a carious lesion at which diagnosis can be made without reasonable doubt. Early detection and diagnosis allow the dentist to counsel and assist patients to prevent the progression of caries and thereby avert the need of invasive, irreversible removal and restoration of tooth structure.In recent years, various techniques have been explored to address the need for better detection tools to aid dentist in the diagnosis of early caries and several of these methods have been...