Is my resistance to novocaine related to the hypermobility of my jaw?

I was diagnosed with hypermobility in my jaw about 10 years ago. I was supposed to have it surgically repaired, as it is apparently relatively severe, but my insurance ran out before I was able to do so.
Today I went to the dentist to have a tooth fixed, and the novocaine did nothing. My dentist said that it may be related to my sloppy jaw. I did some Googling, but this phenomenon seems to only be related to people with Ehler-Danlos syndrome, which I have no reason to believe that I have.

Can this phenomenon be exclusive to local anesthetic being ineffective in the jaw area, since that is the only loose joint that I’m aware of? My face and lips go numb, but my jaw and teeth do not.