Q. A few years ago I noticed my back top teeth turning black and slowly move forward. It starts on the bottom and a little hole gets bigger. I brush and floss and I feel its not helping. I also have a broken back tooth. My dentist says hell have to extract them after my fills work off. I am 24 and do I need false teeth such as dentures? Are there implants avail for my teeth? If so are they made straight and white?