Over brushing your teeth can cause a lot of damage. This is part of the problem I have with my teeth. Before I knew I had OCD, I would carry my tooth brush with me and brush my teeth 10 or 12 times a day. It was a difficult habit to change. When people think about OCD, they don’t tend to think of brushing teeth. But I was obsessed with having smooth teeth. I would brush whenever I lost that smooth feel on my teeth. Because of that, I have sensitive teeth, receded gums and thin enamel. All too often, the compulsive behaviors are harmful.