Sticky, chewy snacks, like caramel and gummy bears, get stuck in the teeth easily. Candy corn is full of sugar and sour candies have high acid levels that break down tooth enamel. Also, jawbreakers actually are hard enough to chip your teeth.
Dentists recommend anything sugar-free. And surprisingly, they've good things to say about chocolate because it melts quickly. But the benefits go down when there are nuts and caramel inside because they are more harmful to your teeth.