Sensitivity In Upper-Right Teeth

For the past ... oh, month, two months, since my check-up -- I don't mark these things because I assume an ailment I get will just go away, but this one didn't -- when I have bitten down on food, my upper right teeth hurt.  It doesn't happen all the time, and it sometimes goes away after a while.  But I feel something up there, and since it's not going away, I am a bit concerned.  Does it have to do with me grinding my teeth at night?  Does it have to do with the weather?  More importantly, will this stop, or will I eventually lose my teeth?

Just marking this here.