I am 71 and I have been noticing that my teeth seem to be getting darker along my gum line. It not like this happen over night but I may just be paying more attention to it. I notice in a photo take of me not too long ago that my teeth seem so dark so I think that way I am starting to see my teeth color. Is this do to age? I see a dentist once a year since that all I can really afford to see one. My dentist is costly and seems to go up in cost every year I see him. Guess I am looking for advise on why my teeth may be getting darker.