The side of the tooth rot hole can be filled, depending on the situation need to remove the decay after resin filling or root canal treatment after filling, it is recommended to seek medical treatment as soon as possible. 1. Lateral cavities can be found on the proximal or distal surfaces of the teeth, due to long-term food impaction or cleaning is not in place, resulting in dental caries, the need to use specialized instruments from the jaw to reach the neighboring surfaces, grinding and preparing a certain hole shape using resin filling. 2. If after removing the decayed tooth tissue, the pulp has been penetrated also need to carry out root canal treatment, and then resin filling, and later recommended crown restoration to protect the tooth. The side of the tooth rot hole can be filled, the treatment method is the same with other parts of the tooth caries, it is recommended to timely medical treatment to avoid deepening of caries.