42. Why are hard candies especially bad for teeth?
(A) They may break the child’s teeth.
(B) They contain too much sugar.
(C) They help bacteria to produce tannins.
(D) They stay in the mouth for a long time.

答案：登入後查看
統計： A(3), B(5), C(6), D(28), E(0) #622029

詳解 (共 1 筆)

#1137367

It is not exactly what a child eats that truly matters, but how much time it stays in his mouth.

the most damaging stuff is something that is sticky or very hard and thus stays in the mouth for a long time. 
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