hmms yea most likely cavity or infection in tooth. [is the back tooth open?

as well do you have liek dental numbing junk you can place on it? and what ivedone if tis like what i faced placed the numbing stuff let it drip directly into tooth hole to numb an seal then take ibprofen to reduce any swpelling that coudl be pressing on th enerv. [recent wenth rhough dental work XD any hydrocodine or vicodon stuff terats pain not swelling so if pain is from swelling it stays till swell comes down.