A few days ago when i was brushing with my sonicare tooth brush over my lower left teeth , I felt extreme pain that took me to the floor! I never had a cavity, xrays always clean and I see the dentist 4 times a year. I just went a 2 weeks ago and clean bill. It doesn t hurt when i eat, clench my jaw, or brush with a manual tooth brush. The only thing I can think of is when i was playing with my dog (a Mastiff no less) I got a paw to the face when we were playing (accident of course). It didn t hurt and it didn t even leave a mark but I have noticed that when I close my mouth, my lips are shut but not my teeth. I tried OTC stuff but nothing helps.