Do you have black stains on your teeth? Your drinking water may have a high iron content

(Natural News) Did you know that drinking water that contains too much iron can cause black stains on teeth? A study published in the journal Scientific Reports revealed that the high iron content and high pH level of consumed water and saliva are the reasons behind the appearance of black stains on gum-adjacent dental plaque....

from NaturalNews.com http://bit.ly/2Wn9xXn