The answer to your question is as follows.

Generally, the swelling will be reduced in about 3 days.

Part of the oral cavity is rich in blood supply, and the wound recovers quickly.

So don't worry.

But pay attention to temporary diet, don't eat hot food, because too hot will relax blood vessels and cause bleeding. It is best to give priority to tenderness, and eat some liquid food first these days.

About brushing your teeth, because I don't know the location of your wound, it's not easy to talk nonsense.

For the sake of prudence, don't brush your teeth first, just rinse your mouth with light salt water.

I wish you a speedy recovery.