You may do several things if you have a dental emergency and cannot contact your dentist. Here are several examples:
While you're in agonizing pain, use over-the-counter painkillers to get the discomfort under control.
To lessen the swelling, rinse your mouth with a saltwater solution.
To minimize swelling, use a cool compress on the swollen cheek.
Bite down on the bleeding region with gauze or a piece of cloth while applying pressure if there is a lot of bleeding.