Why does the left side of my mouth feel like I'm biting down on the tooth after a bonding filling procedure?

I had it done a week and a half ago and i thought last friday that i had lost it while eatting but then i went back to the dentist to have it checked out and my dentist said it was fine and everything was good and she even filed a pointy part down . So WHY does my left side feel like im biting on the tooth? when will that get better so i can eat normal again without feeling weird biting down feeling everytime on the left side?