Dents in an Apple MacBook laptop computers happen occasionally, either by accident, carelessness or during shipping. Dents are unique to MacBooks with aluminum cases or bodies; plastic laptops crack, but do not dent. Some dents on the body of a MacBook can be repaired, though you are risking further damage to the machine if you do not perform the repairs correctly. If the dent affects the computer's performance or damages the screen, bring the computer to an Apple store.
Use a toilet plunger to try to fix the dent with suction. This works only if the dent is on a flat surface of the laptop, and does not work 100 percent of the time. Place the plunger over the dent and press down gently to create suction.
Pull the plunger back up, slowly and gently, until the cup of the plunger is back to its original position and shape.
Remove the plunger from the MacBook carefully and inspect the dent. If you notice an improvement but the dent is still there, you can perform the action a second time.