Car doors are designed to open and close with minimal effort, but they can still cause damage if they come into contact with another car. Depending on the force of the impact, the other car's door could be dented, scratched, or even broken. In some cases, the force of the impact could also cause injury to the occupants of the other car. If your car door hits another car, it's important to assess the damage and decide whether you need to make a claim on your insurance policy.