If you are dealing with a severe toothache, it is worth considering whether the pain is coming from inside or around your tooth. Pain resulting only from irritation outside your tooth can sometimes dissipate within a couple of days without professional dental intervention.
However, if the pain persists, intensifies, or results in a fever, you should call your dentist. As a preventative measure while waiting to see the dentist, try to avoid chewing on the area of irritation to avoid any further discomfort.