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Fluorosis affects which layer of the tooth?
Enamel
Dentin
Pulp
Cementum
The correct answer is: Enamel
Fluorosis is a condition that occurs when teeth are overexposed to fluoride during their development, leading to changes in the enamel structure. Fluorosis affects the enamel layer of the teeth by causing discoloration and weakening of the enamel. This discoloration can range from white streaks to brown stains, depending on the severity of the condition. Therefore, the correct answer is A. Dentin, pulp, and cementum are not typically affected by fluorosis since it primarily impacts the enamel layer of the tooth.