Hi, I'm 19 and I noticed today that I have what looks to be a small hole--maybe 1.5 mm across, plus maybe a tiny one that might forming between the next pair of teeth to the left--in the gums immediately to the left of the piece of skin stretching from my lower lip to the teeth in the lower front part of my jaw. A few months before this all I'd noticed was that my gums were receding a little to where I could see the dentin, especially on my lower canines, and I've been using a softer tooth brush since then. Can anyone tell me what this might be from and how I can fix it? Thanks.