It feels as if the gums between a couple of my lower right molars has a loose piece of skin, and I find myself grinding that piece of skin -- either actual or perceived -- between my teeth. I've been using floss picks daily in an attempt to sever this mysterious loose skin against a molar, but I don't know that I've succeeded and the sensation returns almost daily. (I think the grinding is also causing muscle soreness close to my left ear). There no pain otherwise, and no blood, but the constrant urge to grind is annoying. I have good teeth otherwise for a 40+ year old. What's really going on here, and what can be done about it?