New orthodontic thermoplastic materials: New types of thermoplastic orthodontic aligners and retainers: The training course provided a brief overview of what these orthodontic appliances (Aligners and retainers) that are thermoplastic-thermoformed, their main types of aligners and hybrid retainers, their sub-types, their latest updates, the materials used in their manufacture, the method of manufacturing these retainers in the laboratory, the features and characteristics of each one, the steps followed to manufacture them and place them in the mouth, and the advice given to the patient