question: I was whitening my healthy teeth last week using trays each night for a week. Also as normal I was brushing flossing and using teepee brushes to clean between each tooth as I always do. Then I woke up to find that between my bottom front teeth from nowhere I suddenly had 5 black triangles   I am devastated because I have no gum disease and normally my smile is my pride and joy- will the damaged papilla regenerate itself and how long will it take to regrow and fill these ugly black triangles ?Thank youSally-anne