Description Caveman Cavity Teeth by Billy Bob! These teeth custom fit to your own teeth using a special fitting material that can be used over and over again. How Do They Work? Billy Bob Teeth are specially made to custom fit to your own teeth, providing a unique fitting material that makes these fake costume teeth fit over your own teeth perfectly without using any glue or adhesives! Simply heat the material in hot water and place on the back of the Billy Bob Teeth. Are They Re-Usable? Absolutely! Once your custom Billy Bob Teeth are fitted you can use them over and over for years to come! If the fit ever becomes loose you can reheat the material and refit them at anytime.