This thermoplastic fitting material can be shaped and reshaped any number of times until you get the exact fit that you want. The material can be heated in hot water and when it reaches about 140 degrees F the granules form a mass of melted material. When removed from the hot water it can be shaped and positioned onto the veneer and as it cools down it can be fitted over the teeth. Once cooled it becomes a solid material that can be trimmed to fit. CAUTION: Do not allow material to cool in the mouth.