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Please google it. You will get lots of remedies. I will suggest your gf to dab a small amount of clove oil onto a cotton ball and apply it to the affected area.

That’s true, there are so many at home remedies

Depending on where you live, you might be able to get the tooth fixed at a dental school for much less money! I am so sorry to hear about the pain, that is the worst! If it is a broken tooth, fill it with dental wax. Holding whiskey in your mouth for a minute can give short relief, or try an ice pack.

Thank you very much