Tooth decay in the incisor gap, more commonly known clinically as caries, is treated primarily with a resin filling or, if the pulp is involved, a root canal.
If the pulp of the tooth is not involved, a filling should be performed. Depending on the depth of the decay, the filling method will vary.
If the decay is shallow or moderate, then a resin filling can be done directly. If the decay is deep, i.e., the tooth reaches the deep dentin layer or is very close to the pulp cavity, then it is necessary to protect the pulp by using a preparation such as calcium hydroxide to protect the pulp, and then fill the tooth with resin.
If the decay is deeper and involves the pulp, root canal treatment is required before restoration.
It is recommended that you visit a hospital promptly for treatment of tooth decay in the incisor gap under the guidance of your doctor.