In special FX, actors teeth often has to look different. It could be as simple as painting on discoloration or as complex as doing a scary set of false teeth, made to perfectly fit inside the actors mouth. This video deals with the latter. Mark Viniello from Stan Winston School demonstrates how a teeth mould and finally a cast of the teeth are made from sodium alginate and dental stone. This cast can then be used as a base when building up materials on it, to resemble the scary FX teeth. Sodium alginate is in general a very interesting material that can be used for many crafting projects, we doubt this is the last time you will see it mentioned on our site.