Arnica montana in the 30x potency should be taken as soon as possible after the injury. Take four tablets every waking hour for the first day, then cut back to four tablets every other hour. Don't handle the tablets, but shake them out of the bottle into the cap. Place under the tongue and allow to dissolve. Wait 15 to 30 minutes before putting anything else into your mouth. You can increase arnica's effectiveness by avoiding caffeine, mint (in some toothpastes), and camphor (contained in many muscle rubs) during the duration of your treatment.