We can use this small suction cup to repair the small dent in the door and suck the suction cup in the dent. If the dent is large, you can also prepare a few more and absorb them evenly in the center of the dent. Then you can pull it out with a tool. It is possible without tools, but it requires skilled strength, otherwise the depression is likely to become prominent. There is a bridge suction rod specially designed to repair the sag on the Internet, which can suck the sol gasket we put on, and then turn the nut until the sag becomes flat. If you don't want to do it yourself, then we can give it to the repair shop outside. They have a dent repair technology, also called light sheet metal. But I don't think the dent repair technology is much different from what we did ourselves. Basically, we suck out the dent with a sucker, then put a hook on the back of the dent area, then gently push it out, and finally treat the protruding part with a rubber hammer. It is enough to suck the dent in the skirt with a suction cup. Absorbed on the object by the difference of internal and external atmospheric pressure, it has a very large tearing force: 1. Repairing the dent in the car is to restore the sunken part of the paint to its original state. Generally speaking, acute angle and obtuse angle depressions can reach the original state. 2. The main reason is that dents without paint can be repaired as before, hail pits can be repaired perfectly, and corners and ab sub-holes are not easy to repair. Dent repair is based on the principles of optics, physics and mechanics, and uses the lever principle to influence vehicles for various external reasons; 3. Dents of different sizes on the car body are modern scientific and technological means as long as they do not damage the paint surface of the car body and do not overstretch the metal surface.