See a dentist ASAP. Ibuprofen or tylenol (acetaminophen) can help briefly with the pain, as can an ice pack held against the jaw, or sometimes drinking a hot drink like tea. Problem is, that doesn't correct the underlying cause, which usually something serious like a cavity, an abscess, or a cracked tooth that needs to be treated. See a dentist as soon as you can.
Exam and treat. See your dentist as soon as possible to determine the source of your tooth pain. The dentist will take xrays and do a thorough exam. A tooth ache is most likely due to a cavity. Treatment can be as simple as a small filling or if worse a root canal. Until you can get to the dentist, try otc analgesics such as advil (ibuprofen) for pain control.