Tooth hurts after composite filling, how long does the pain last?

1-2 months: Unless there is an injury to the nerve, it could take 1-2 months for the sensitivity to go away. If the nerve is injured, then a root. Anal treatment may be needed.

6-8 weeks: It is normal to experience sensitivity after you have recently had a filling up to 6-8 weeks. Do not worry, as long as the tooth is gradually improving. Sometimes, the decay could have been too close to the nerve of the tooth and in some cases the tooth will need a root canal therapy to stop the toothache.