Demi Moore claims stress helped cause her to lose teeth. A study has proven this can happen and shows links between stress and gum disease. When you are stressed you can forget to brush and floss your teeth. Sometimes you forget to go to the dentist for a long time. Stress can also cause you to grind your teeth more. You can do it asleep and even awake without realizing it. Some signs are sore jaw or tooth sensitivity. Too much grinding can cause your teeth to fall out. It turns out your dentist can give you exercises to help with teeth grinding.