He is 10 months old. For about 2 months maybe he’s had this mark on his tooth! This was a picture from last month and it’s getting darker!! I’m very concerned. I hardly give my baby sugar, he has juice once in a while but could this seriously be a cavity?? I watch what I give him to eat, I would be so surprised if this was a cavity. I brush his teeth every night. Now he is all boy and is already walking/running around and always falling so could it be a chance he’s bruised it?