Area where the crown joins root?

The area where the crown joins the root of a tooth is known as the cemento-enamel junction (CEJ). This junction marks the transition between the enamel, which covers the crown, and the cementum, which covers the root. It is an important anatomical feature as it helps in the attachment of the tooth to the surrounding periodontal tissues. Proper health of this area is crucial for overall dental health, as it can be susceptible to decay and periodontal issues.