If there is serious damage to the body, or large sections require replacement, this means that it will be necessary to weld new panels and sections - these operations are best left to specialists.
If the damage was caused by an accident, it is necessary to check the shape of the entire body, which can only be carried out by specialists using special equipment.
If the body remains deformed, this is very dangerous, since, firstly, the vehicle's handling will deteriorate, and secondly, an uneven load will be placed on the steering, suspension and, possibly, transmission, which will lead to increased wear of tires, suspension elements or steering management.