It is acidic like coca cola and if you drank enough to take the enamel of of your teeth then you might have a problem...but i can only drink a tablespoon or two a day and it probably never touches my teeth.... whew ...I am trying to get it down as fast as I can.... I have seen that warning before and I would like to see if you soaked a set of teeth in Coke & another in ACV, which would take the enamel away first... I know people who drink a liter of Coke a day...& considr themselves normal but if you did that with ACV...wooo...yikes...