If your car is generally in good shape, shiny, no obvious rust, and with a good clean and polish is still worth a lot of money, it makes sense to repair minor dents and scuffs as they occur. Wait too long and suddenly you realise there are so many blemishes that your motor has become a sad reflection of what it was.
Many types of car body damage can be fixed with paintless dent removal. It is a craft in its own right, and minor damage is skilfully ‘massaged’ away without the paint being affected. This has the benefit of not making any warranty on the car bodywork null and void.