Resin filling is a very common technique in oral treatment. For the melon seed teeth with small defects and shallow gaps, resin filling is an ideal choice. Doctors typically treat cavities by making the cavity a small opening and a large base, so it will not come out when the resin is cured and there are no other problems. However, for the teeth with severe caries and large area defect, it is often easy to break the teeth during chewing due to insufficient resistance of the tooth itself after tooth restoration. Therefore, it is better to confirm the size of the gap before tooth filling, and then choose the appropriate way.