For a severe toothache, you can take paracetamol or ibuprofen to relieve pain temporarily. Rinse your mouth with warm salt water and avoid very hot, cold, or sugary foods. This will only reduce pain temporarily. See a dentist for proper treatment.

For immediate relief from tooth pain, you can take paracetamol or paracetamol with an anti-inflammatory. Rinse your mouth with warm salt water and avoid very hot, cold, or sweet foods. This will give temporary relief only. A cavity needs dental treatment (filling or root canal). Hence, please see a dentist as soon as possible to fix the cause of the pain.