Abstract
The present project will be divided in two studies. The aim of Study 1 will be to evaluate the influence of smoke (1 pack of cigarettes per 5 days) and pH cycling (30 day cycle) on chemical composition and microhardness of surface and sub-surface of dental substrate. For that, 40 bovine incisors fragments (enamel and dentin) will be divided into 4 groups (n = 10) according to the followin…