question: Hi, Im 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 Id noticed was that my gums were receding a little to where I could see the dentin, especially on my lower canines, and Ive been using a softer tooth brush since then.  Can anyone tell me what this might be from and how I can fix it?  Thanks.