I recently noticed a dark area on my front tooth. I think it just showed up since i have been using the vivid white tooth paste but am not sure. I brush my teeth regularly but i smoke cigarettes and drink a TON of coffee. which is taking a toll on my teeth (hence the whitening). I have not been to the dentist lately and am worried its serious!!! i dont want my tooth to rot !! Am making an apt but in the mean time, please help. Any advice welcome.