With Halloween one week away, dentists are warning adults that some of America’s favorite candies can be especially tough on teeth. Sour Patch Kids, Skittles, gummy bears, sticky fruit chews, and hard candies are among the treats worth watching. Reese’s Peanut Butter Cups and plain chocolate bars are generally gentler choices.

The difference isn’t simply sugar. Acidity, stickiness, and how long candy remains in your mouth can determine how much trouble a Halloween treat causes.

“Not all Halloween candy affects your teeth the same way,” Jack Goertzen, DDS, DMD, a dentist affiliated with Aspen Dental’s nationwide network , tells Men’s Journal .

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Five Halloween Candies Dentists Say to Watch

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Goertzen identifies five concerning categories: sour gummies, sticky fruit chews, gummy bears, chewy candies such as Skittles, and long-lasting hard candies.

Sour Patch Kids combine several problems.…