Dear Lybrate User The pain
from jaw to mouth may be due to jaw problem or due to cavity in teeth. U may go for a test of OPG first and consult any Dentist
there. Let me know the opinion of dentist. Meanwhile Cut a piece of onion to a small size that will fit comfortably in your mouth. Put the cut slice on the affected tooth. Allow it to sit for 5 to 10 minutes. Thoroughly rinse your mouth with salt water to prevent onion breath. Repeat 2 or 3 times daily for a few days.