Homeopathic Hypericum can be a great remedy for a toothache. It's the homeopathic version of St. John's Wort. I have hypersensitivity -- particularly in the tooth area -- so if there is even a minor irritation it can blossom into a lot of pain. Once when my dentist packed a cavity too tight the nerve was throbbing until I tried hypericum. I would have had to have a root canal or an extraction otherwise! Try hypericum 30c every 3 hours until the pain goes away. If it doesn't after a couple of days then another remedy is called for.