The Indifference Engine
It's now compromised in that area. If you hit with that area you risk serious injury. Is your head worth the $200 for a new helmet? If so, replace it.
Remember your helmet is designed to BREAK when dropped so your head doesn't. This means that after one drop the helmet is damaged and its ability to protect your egg like skull is compromised. Imagine ever being able to ride again...Yeah mine was a $100 HJC Osiris (DOT and Snell certified) lightly-used from Craigslist, so I'm not super concerned about dropping it.