What happens when you get that sudden toothache and you can't get to your dentist?
The severity of a toothache can range from a mild discomfort to excruciating pain, which can be experienced either chronically or sporadically. This pain can often be aggravated somewhat by chewing or by hot or cold temperature. An oral examination complete with X-rays can help discover the cause. Severe pain may be considered a dental emergency.
Sometimes, pain that's felt in the tooth is actually due to pain in other parts of the body. This is called referred pain or radiating pain. For example, an earache may sometimes cause tooth pain.
Over-the-counter pain medications may be used while waiting to see the dentist or primary health care provider.
For toothaches caused by a tooth abscess, the dentist may recommend antibiotic therapy and other treatments, like root canal.
To prevent tooth decay, use good oral hygiene. A low sugar diet is recommended along with regular flossing, brushing with fluoride toothpaste, and regular professional cleaning. Sealants and fluoride applications by the dentist are important for preventing tooth decay.
Seek medical care if:
You have a severe toothache
You have a toothache that lasts longer than a day or two
You have fever, earache, or pain upon opening the mouth wide
According to this resource you can use regular products that you can find around the house to relieve tooth pain.