Lump under my tounge

hi

please can someone help. ive been to the dentist today, never thought to ask about this lump. went in the waiting room and saw a poster about  mouth cancer, i feel sick, i couldnt go back in and ask cause i dont want to know.

i have had this lump for about a year, it is right under my tounge at the back on the left. most weeks it doesnt bother me and i dont know its there. every now and again when i eat the left gland just under the lump swells and it hurts when i eat.gets bigger and sorer the more i eat. after about half an hour it goes down. this happens throuout the day but by the next day it has gone or even the night. please help what could this be, i have been reading on the internt about tori, could this be what i have?? if so is there any treatments??

please help i am really really worried. im am 19 never smoked.
just to add i had a brace for 2 years top and bottom i also have a large filling on one of my back lower teeth, which is close to where the lump is. the dentist did say next time it would need root canal.

thanks very much

[scottma]

The lump is probably caused by sialolithiasis, in which condition there is a stone partially blocking the secretory duct of salivary gland. Seeing an oral surgeon is advised.