Well, that's too bad. With poor dental hygiene, you're at risk for gum disease, receding gums, cavities, and exposed nerve that can cause a toothache. It's a good idea to get routine dental cleanings at least twice a year and to take good care of your teeth between cleanings -- but you probably already knew that!
Do you regularly eat or drink acidic foods or drinks? For example, some people like to chew on lemons (believe it or not!).