The plastic dent in the rear of the car can be treated by heating. After the dent is heated, it can be restored to its original state by plastic elasticity. General auto repair units have infrared baking lamps, which are specially used to repair such parts. After heat setting, repair the paint surface according to the damage of the paint surface. If it is damaged, it can be repaired by plastic welding, polished and painted after welding. If the damaged part is defective and holes are formed, it can only be replaced.