Tooth-related habits, too, can be conscious (brushing and flossing) or unconscious—chewing on pencils, for example. Dental habits become bad when teeth are expected to do things they're not cut out for—opening bottles, chewing off the little plastic tags on new clothing, trimming nails, and so on. And bad dental habits can be downright dangerous. To name a few: Swiss Army Mouth Mistaking your teeth for a sort of all-purpose bottle-cap-removal-unit-plus-toolbox [...]