Visit the nearby dentist for proper diagnosis....there might be chances that the tooth might be fractured also bcz of missing crown

Hi. A properly done rct has a success rate of over 95%. You need to get an x-ray done to see what exactly is the reason for the pain. If there is a repeat infection in the rct treated tooth, you need to get the rct repeated. It is also possible that a tooth near the rct treated tooth might be paining. Get an x-ray done to confirm the exact problem