• gutta-percha /ˌɡʌtə ˈpɜːrtʃə/ [uncountable] -a natural substance that can be shaped when it is heated and is hard when cool, produced by certain Malaysian trees -What Is Gutta-Percha? Gutta-percha is a material used to fill a tooth after a root canal procedure. Gutta-percha, a plastic substance from a Malaysian tree called a percha tree, is used as a permanent filling in root canals. During th..