Aligners, typically used in orthodontic treatment to straighten teeth, are commonly made from a type of thermoplastic material. The most frequently used material for aligners is a patented blend of medical-grade polyurethane plastics. This blend provides the necessary flexibility for tooth movement while maintaining durability and clarity.The material used in aligners must be biocompatible, meaning it should not cause harm or irritation to the gums or other oral tissues. Additionally, it needs to be transparent to ensure discreetness during wear.Aligner materials are designed to be comfortable for the wearer while exerting gentle pressure to gradually shift teeth into the desired position. They are custom-made for each patient based on digital impressions or molds of their teeth.