If you aren't willing to visit your dentist or want to temporarily relieve the pain while you think about what you'll do next, there are some home remedies that can relieve the tooth pain pretty fast. - Mix salt and pepper [preferably cayenne] with some water to form a paste and apply it to the teeth causing you pain. - Chew raw onions. They'll kill the pain after a little while. - Apply avocado seed powder on the affected teeth. - Dissolve some salt in warm water and use that mixture to rinse your mouth.