What is the treatment for pulpitis?

Depends on whether: It is reversible or irreversible pulpitis. The former can often be relieved with an occlusal adjustment / palliative treatment. The latter required endodontic therapy (root canal therapy).

Depends: Pulpitis means inflammation of the tooth pulp (nerve) causing tooth to hurt. It can be reversible or irreversible. Reversible pulpitis can be eliminated by removing the cause. Adjusting a new filling/crown that is too high or wearing a night guard to prevent grinding will stop pulpitis. Irreversible pulpitis is when the pulp is too sick to heal itself and a root canal or extraction is required.