Anyone out there have any sudden issues with your teeth. I've always taken excellent care of mine and they always look great. woke up yesterday and theres a black hue on the front top 6 that is very noticeable. Nothing has changed at all as far as diet, etc. Went to dentist, he has no idea why this happened. I'm 52 and going thru menopause with other symptoms, I'm wondering if this could be just another symptom.