When your windshield cracks or chips, the layers of laminated glass in the windshield separate. This space allows air, water, and debris into the damaged area. Over time, small bumps in the road, changes in temperature, and additional impacts from debris can cause the damage to spread. Something as simple as washing your car may be enough to trigger an expansion of the damage. If left untreated, the damage will eventually ruin your windshield. It is very important that you have your windshield repaired before the damage gets too large and must be replaced.