My #14 had a r/c 7 years ago. it's now very painful and i believe infected. cracked tooth or maybe cracked filling??? is an endodontist my best c

Yes: Definitely, an endodontist. Your regular dentist may be able to tell if the tooth is too far gone and has to be extracted.

See an Endodontist: The key is to have an Endodontist with the diagnostic skills to be able to do a proper diagnosis of your problem. An endodontist is a dentist who has completed a 2 or 3 year specialty program about root canals.

Tooth#14: If a tooth that had a root canal becomes painful, it usually means that the infection has returned, or never healed completely. It's also possible that the tooth is fractured, especially if did not have a crown placed after the root canal treatment. If the tooth is reinfected, the root canal will need to be redone. See your dentist for an accurate diagnosis.

Could be either: It could also be sinusitis. Please have a dentist evaluate the tooth. If the root canal needs retreatment or an apicoectomy, an endodontist is your best choice.