(CNET) — Apple likes glass. A lot. You can tell that much from its many retail stores, and in its products where glass is used in displays, notebook trackpads, and both the front and back of the iPhone 4.

That last place, though is what might be causing the company some headaches.

That’s according to a report today from Gdgt, which says that slip-on cases — the kind that cover the back and sometimes front of the iPhone 4, have been the cause of serious cosmetic damage with the backside of the iPhone. Dirt and other loose bits of debris from your pocket end up in that space.

Over time, that can lead to a shattered backside as small scratches grow to become large cracks that travel across the back of the device, much like a ding on a windshield.

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