I'm biting down hard on my tooth. Why is this and will this annoyance go away so I can eat normally again?

I had a bonding filling done on my upper last tooth and a few days later while eatting i thought i lost it but i went back this past tuesday the dentist checked it andsaid it was fine nothing was wrong and she filed it a bit down on one of the pointy bits but it still feels when I'm eating on that side