After the root canal treatment, the doctor basically knows the overall length of the root and determines the length of the pile according to this length. The pile is then completely glued to the root with a self-etching adhesive, and the upper part of the pile is shaped. The piling is painless because the patient has already undergone root canal treatment and there is no more nerve, but there may be some vibration because the drill is a slow handpiece, then the patient may have a little discomfort, which is normal.