Invisalign is a type of removable denture, which is known for its use of elastic resin retainers that are located at the gum margin of the natural teeth and provide a good simulation. The elastic resin is more flexible than ordinary plastic and can be used as a retention device instead of wire. The invisible denture is characterized by high strength, suitable elasticity, good flexibility and translucency, its color is close to the natural gum tissue, with good bionic effect and good concealment. It is different from the flexible resin used for denture lining in terms of chemical structure, performance and use, and has no chemical bonding with the flexible lining resin and traditional resin artificial teeth. The Invisalign denture replaces the metal ring and base of the traditional denture with a highly elastic, fracture-resistant, non-toxic and odorless polymer. All parts of the denture, except for the artificial teeth, are flexible, have a similar color to the gum tissue, are transparent, and contain “capillaries” with a bionic effect. In a humid environment, the volume is stable, the volume is stable, the elasticity is good, and the sturdiness is good, so it will not break no matter if it is dropped, bent, or even twisted by stepping on it. It has strong concealment in the oral cavity and can achieve certain simulation and bionic effect. To make the invisible denture, the abutment preparation is the same as the removable partial denture; the denture support is made according to the requirements of the cast denture support; an accurate functional impression is made and the model is turned with hard plaster; the teeth are lined up and the wax base and wax retainer are completed; the box is mounted in reverse (the same as the full denture), and the base, retainer and artificial teeth are completely exposed; the casting channel is inserted with high fusion casting, de-waxing, casting and polishing, and the surface is polished with a rubber wheel before polishing. . Polishing is done with a wet cloth wheel with polishing powder. The invisible denture has no metal retainer, the crown set is beautiful and realistic, the abutment is thin and flexible, and it can enter the abutment recess, which is not only good retention, but also the edge is closed tightly, not easy to embed food and more comfortable to wear.