Pain in the upper teeth often indicates deep decay or infection inside the tooth, and in such cases Root Canal Treatment (RCT) is usually the right choice to save the tooth and relieve pain. RCT removes the infected pulp, cleans the canal, and seals it, preventing further damage. It is generally safe and effective. However, you may confirm with a dentist (and get an X-ray if needed) before proceeding to ensure it is truly required.