Not a day goes by without a patient coming in with a cracked or chipped tooth. In most cases the reason for the damage is clenching or grinding. But sometimes the patient is not convinced that, the reason the tooth broke, is his habit. The main reason is that most people do it at night when they are asleep. This is where a recently introduced splint comes in handy. It is a thin layer of plastic coated with pink paint. The patient can wear it during the night and examine it in the morning. If the paint comes off the plastic, it is a clear sign that there was clenching and grinding going on at night.