In most cases, the wisdom teeth are tilted or horizontally blocked, causing decay and resorption of the 2nd molar in the far middle. In this case, we should consult the doctor as soon as possible, remove the wisdom tooth directly when the wisdom tooth is not painful, and then check the specific damage of the 2nd molar, if the damage of the 2nd molar is slight and most of it is located in the crown part, we can consider to apply the repair method directly, remove the absorbed and decayed part and fill the corresponding part with filling material. But in this method, because the filling part is located in the distal center, and there is no adjacent gap of the corresponding tooth, it is especially easy for the filling to fall off during the chewing activity. Therefore, in most cases we perform a repair and then apply a crown restoration directly to protect this tooth. Of course, if the obstructed wisdom tooth causes, the 2nd molar is more extensive decay. Then it is very difficult to repair, so we can only extract the 2nd molar and apply implant prosthesis or movable restoration to restore the 2nd molar.