A child spends 8 years of life in a temperate climate where the drinking water had fluoride of 3 ppm. The teeth that are effected are:
(A) All primary teeth (B) All permanent teeth, except third molars (C) Incisors, canines, premolars and third molars (D) Only molars
(B) Enamel fluorosis is a developmental phenomenon due to excessive fluoride ingestion during amelogenesis. Once the crowns of the teeth are formed, no further fluorosis can be induced by additional intake of fluoride or by posteruptive topical applications of fluoride.