If you have a toothache at night and your dental nerve endings are exposed, my best advice is garlic. You can put a small piece of garlic on the aching part of your tooth, it will immediately relieve the pain after a high pain at first. Since the garlic will destroy the inflammation there, it works if the nerve is open. Of course, if you don't go to the doctor as soon as possible, you may experience more severe pain and/or lose your tooth in the future.