OTC pain medication. There are no real home remedies for a toothache in the sense that they can cure or treat the cause of the problem. You need to see a dentist to determine the cause of the pain, and then render the appropriate treatment. In the meantime, you can take any otc pain medication that you would normally take for a headache. Avoid hot and cold food and liquids and eat on the other side.
None, really... There are no home remedies or cures for rotten teeth. No magic pills or rinses or mouthwashes. Toothaches need to be treated locally by a dentist, someone who has years of experience treating these conditions. The sooner you call the sooner you will feel better. Please don't delay, the pain may soon be unbearable.