There are different types of casings: The one located on the bottom of the computer where the motherboard, hard drive, optical drive, etc. are located. On the other hand, we have the casing located on the top where the touchpad and keyboard are. The other casing is formed by the top cover of the screen, which is an area very exposed to dents due to objects falling on it. A small dent on any of the casings will not affect the performance of your product in any way, it is purely a cosmetic flaw.