long-standing principle held by epidemiologists who study the health status of human populations is that any disease can demonstrate important variation among people with different characteristics, across different geographic locations, and over time. Substantial fluctuations in the amount of disease can occur as the relative importance of diseases rises and falls, usually in response to scient...

Dental caries remains one of the most common infectious diseases of mankind. Dental caries and its consequences together constitute a very real and personal problem for almost everyone.Several studies indicate an association with smokeless tobacco and caries but tobacco smoking and its relation to dental caries is a subject of many opinions.The present paper discusses various studies done in th...