I am close to fifty years old. I just had a dental appointment and they acted like grey teeth at fifty was not normal. They asked if I took medication as a child when the teeth were forming. I did not take any type of med that could make your teeth turn grey. In fact I had very white teeth as a child. I thought aging and grey teeth went hand in hand. Is it possible that fibro/CFS bring on grey teeth? So many people use the teeth whiteners I am not sure how teeth look at fifty. I am thinking of using the whitener but I am concerned about the chemicals being used. Is it safe long term?