What should i do about a broken tooth post-root canal?

See dentist: The tooth should be restorable with a post and crown. Depends how much has fractured.

Get it fixed: The most common cause for root canal failure is new infection leaking in. When a tooth is not restored this avenue for reinfection is of major concern. Literature written about this subject suggests reinfection can occur in just 30 days ! i strongly suggest you revisit your dentist to be sure it hasn't already occurred. If the seal is still intact "get it fixed".

See your dentist: Sorry to hear that your tooth has broken after a root canal. Teeth after the root canal seldom as structurally sound as they were originally. And for this reason, they often require the placement of a post and crown for strengthening and protection. See your dentist for evaluation and treatment. Take care.