I was brushing my teeth tonight, when I noticed a mushy little bit by my lower left molar. Thinking it was food caught in my teeth, I got some floss and got it out. It didn't hurt, but it started to bleed a little bit, and then I noticed it was actually a piece of my gum that I flossed out! It was only a tiny piece, but it feels weird in my mouth now and is a little sore. What the heck just happened?

For the record, I did not brush my teeth too hard, nor did I floss too hard, as I am gentle with both since my gums are sensitive anyway (they bleed sometimes when I brush my teeth no matter how gentle I am). I don't drink, take drugs, or smoke. I'm not the epitome of health, but I am at a healthy weight and don't eat too much junk food. Tonight I just had some mac-n-cheese, corn, and a piece of pie for dinner. I have never had any problems in the past when I've visited the dentist (and I saw her just a couple weeks ago and everything was fine). Why did a small chunk of my gum fall off? It's got me freaked.