There is no cure to stop toothache, the only prevention is to make sure that you visit the dentist regularly and clean your teeth twice a day. Sometimes toothache can’t be prevented especially if you get an abscess. This is very painful and needs immediate treatment from the dentist. If you do get toothache then you can use some clove oil and a cotton pad. This is not a cure but it temporarily takes the pain again. In the meantime before seeing a dentist you can take some paracetamol or iburprofen for the pain.