I haven't had my teeth checked up in I think 5-6 years now because I have a huge fear of dentists. My top and bottom front teeth have started to get yellow outlines around them that I want to get rid off. I done some research and this yellow stuff the way I understand it is just old pieces of food that have grown solid, and not actually the teeth it self. Using a metal pick i've tried to get rid of some of it like dentists do and it seems to work. What I'm wondering about is how good idea this is. Can damage your teeth doing this?