Caries to the middle refers to caries at this time the deepest part of the caries extends to the middle of the dentin, at this time most of the teeth have not begun to pain or there will be hot and cold stimulation into the caries cavity, there is a slight discomfort, this time is still considered to be an early case, you can go through the one time to remove the decay, filling that is to achieve a better result. First of all, after going to the dentist, the dentist can take dental radiographs after examining the caries to confirm that the caries has only decayed to the middle of the dentin. Secondly, a high-speed turbine drill is used to remove the decayed portion of the tooth, and the cavity is prepared for resistance and retention, and the cavity is then filled with special filling materials.