In pain and needs dental?? Where did that come from? Does your x-ray vision allow you to see the cats molars from here?? Do you not think that it would also not be eating or grooming etc if it was that painful? bad breath? - These would be a more common and likely indicators of dental disease.
Chin rubbing is commonly normal behaviour for a cat- find a good behaviour book!!, but may be itching. If the cat becomes obsessive, there becomes baldness or there are other things not right about your cat take it to the vet.
Remember Guys- with the best willl in the world, remote vetting isn't a good idea. A little knowedge can sometimes be a dangerous thing!!