While WebMD should not be relied on to diagnose cancer, they do have some great articles and slideshows about your oral health. One of their latest is "19 Habits that Wreck Your Teeth". It varies from the more obvious (hello, opening stuff with your mouth or chewing on pencils?!) to some less obvious, which include using cough drops, sports drinks, or fruit juices. Click here to read the rest of the ways you can damage your teeth.