How long does a toothache last?

A toothache can last for weeks or months until you visit a dentist. Orajel tooth desentisizer is very good on toothaches.
The natural course for an untreated toothache caused by a cavity or other decay is: bad ---> worse ----> abscess --->death. This is generally viewed as bad. Inserting a visit to he dentist early in the sequence can avoid the abscess/death part.