Numbness of lower left lip is not a common manifestation of trigeminal neuralgia or tmj issue. If your tmj specialist does not know how to diagnose and manage, you may need it see an Orofacial pain specialist.
Thanks, it's not a pain just a numbness, my jaw clicks a lot maybe it's a nerve that is trapping. I can usually manage TMJ pain with ibroprofen, but there are periods where I live on them.
There is one nerve branches around the ear area which is also the TMJ areas. This nerve runs down thru the lower jaw or mandible. A good reputable TMJ/Oral surgeon can property diagnose it. If you live near a good teaching hospital go there. You can find diagrams of the mandible that will show you that primarily one nerve serves that lower jaw bone (mandible). Sometimes Sinus problems can give refered numbness and /or referred/pains. I can't diagnose problems so this is my suggestion.