After the tooth has been restored, you need only practice good oral hygiene, including brushing, flossing, regular checkups and cleanings.
Your dentist or Endodontist may periodically x-ray the tooth to ensure that healing has occurred. Occasionally, a tooth that has undergone endodontic treatment does not heal or pain continues. At times, the tooth may become painful or diseased months or even years after successful treatment. Often when this occurs, repeating the endodontic procedure can save the tooth.
Information courtesy of the American Association of Endodontists.