Root Canal Treatment or known as endodontic therapy refers to a process of treating the inner aspects of a tooth including its pulp tissue that contains nerves. The treatment process is to clean the root canal, and then seal it off to protect it instead of removing the tooth. Teeth that have undergone the root canal treatment are called “non-vital teeth” as they will be weakening, easy to break, and turn darker over time. Therefore, an abutment together with a post & core foundation is recommended to strengthen the non-vital tooth. After the treatment, the tooth may last 1, 2, 5 years or forever.