If the hole is not deep enough to reach the pulp, directly remove the decayed material and then perform resin filling treatment to relieve pain; if the hole is deep enough to reach the pulp, then open the pulp and induce popular root canal treatment to relieve pain. 1. If the cavity is not deep enough to reach the pulp, it can be directly filled with resin after removing the decayed material, then the tooth can be used normally, and root canal treatment can be carried out again if endodontic symptoms appear. 2. If the depth of the cavity has reached the pulp, root canal treatment can also be performed directly, but due to the main chewing function of the posterior groove teeth, the force is greater, the tooth after root canal treatment should also be restored with a crown, so as to prolong the service life of the tooth and prevent the tooth from splitting. It should be noted that if the third molar is also caries, can also be directly extracted treatment. At the same time, it is recommended that patients should go to the stomatology department of regular hospitals to receive treatment in order to prevent some unnecessary consequences.