I am lookiing for advice for a problem that is causing me extreme anxiety and depression. I have always had extremely healthy teeth/gums. white nice strong teeth. I am 25 years old. two years ago I noticed browning stains bettween my teeth, especially noticable between my two bottom teeth, but the brown stains are everywhere. (behind teeth) I go to the dentist regularily. They are not taking it seriously. They tell me not to drink coffee, which I don't, or eat things that stain teeth. They also say maybe I am not brushing properly, but I am. I feel like I am going crazy as I get my teeth cleaned, then it starts appearing again within 3 months. I don't know what my next step is?? My medical doctor told me to ask the dentist. could this be body chemistry? imbalance? What can I do?