So I accidentally dropped my Macbook Air the other day and while catching it mid-air, I banged it against the side table. It resulted in some dents and bruises. When I closed the lid, the edges are already un-even.
So this is what I did to fix the dent.
The solid, aluminum unibody of the Macbook Air is pretty tough. However, since the edges are very thin, a concentrated impact can leave some bruises.
And, after banging it again against the dashboard of my car, it actually made several cuts into the dashboard. Still, the Macbook Air lives!