We recommend keeping your device and olloclip free of all debris and foreign particles to prevent any damage to either product. The olloclip will not damage your device. However debris and foreign particles that may come between your olloclip and device could cause damage. Prior to sliding your olloclip onto your device, use a soft, lint-free cloth to clean the corner of your device where the olloclip will be applied. It is also recommended that you ensure there is not any debris or foreign particles on the olloclip itself. Placing an olloclip on a device with a broken screen may cause pieces of glass to become embedded into the olloclip and could cause damage to devices the olloclip is subsequently used with.