It usually takes 1 to 2 days to repair dents in 4s shops, and it usually takes 3 to 4 days to repair dents in large areas. The following is an introduction to the repair method: 1. Hammer method: Hammer method is one of the most common operations to repair concave-convex deformation. For the deformation, indentation and bending of column parts, tools such as wood block, mallet, pry plate, hammer and jacking iron can be used flexibly to directly knock the deformed parts to reset them. 2. Sheet metal forming fixture method: Sheet metal forming fixture is an advanced repair tool in automotive sheet metal. The utility model has simple structure and convenient use. Put a sandbag on the back of the depression, flatten the surface roughly with a mallet, then select appropriate rollers to install on the shaping clip, then install the shaping clip on the hit part of the car, adjust the adjusting bolt, and apply slight pressure between the rollers.