Hi. My baby is 6 months old and has started teething. The problem is there is a black coating over her new teeth. Could it be cavities? Is it possible that the new teeth could have cavities? Or could it be any infection? I am worried about her. I am planning to take her to our family dentist in Scarborough. But before that, I would like to hear if someone faced a similar problem. Is it normal? Will it lead to some gum disease?