I have very sensitive teeth and I do use toothpaste for that problem but it dose not seem to help much. Now my front two teeth on the top are starting to hurt me whenever I have anything cold even cold air hurts them. This is really starting to be a problem for me. I do not know if I have a cavities or if it is just my teeth becoming even more sensitive. I had a friend tell me I may need a root canal. I am not sure now what is wrong.