People need a root canal when they have an infected tooth nerve or a damaged dental pulp, according to WebMD. These conditions result from tooth decay or infections, and they are painful. Removal of the nerve and pulp are intended to prevent further complications and eliminate long-term discomfort.
Without a root canal, a person may experience worsening problems, including deeper decay, multiple future dental procedures and bad crowns, according to the American Association of Endodontists. After pulp removal, the dentist cleans and seals the inside of the tooth to remove the infection and deter future infections. An effective root canal restores the tooth to proper functioning.