Dog scratching/whining because of his tooth

I have no idea what group to post in but my dog just ate his dinner and for the last 20 min, he’s been whining and scratching at his face (right side only) and acting like he’s still chewing something. I looked at his mouth and saw there was a tooth with blood on the side he was scratching. Other than the whining and scratching, he seems fine as he’s wagging his tail and giving kisses. What can I do to help him feel better?