Reader’s Digest states that chewy, sour, and hard candies are among the “worst Halloween candy” for teeth. In general, candy is harmful to teeth because as oral bacteria eat sugar, acid is created as a byproduct, says Dr. Matthew Messina, a spokesperson for the American Dental Association. The acid can then dissolve tooth enamel. Chewy candies are “among the worst offenders” since they stick to teeth, and Dr. Messina notes that sour candies contain both sugar and acid. Reader’s Digest also includes hard candies on the list since they generally linger in the mouth longer. On the other hand, the article states that “chocolate tops the list of best bets,” noting Dr. Messina explains chocolate washes off teeth more easily than other candy options.