Quote Originally Posted by Lenusik
My helmet seem to be not damaged, just a few scratched.
SalsaMTB is right. If your helmet hit the ground, it needs to be replaced. Bike helmets are designed for a single crash only.

As a reference, here's a page from the Bicycle Helmet Safety Institute on when to replace your helmet: http://www.bhsi.org/replace.htm.

--- Denise