Fixed functional appliances in orthodontics normally known as "non-compliance Class II correctors" are devices used to correct jaw discrepancies, particularly Class II malocclusions, where the lower jaw is retropositioned. Unlike removable appliances, these are attached to the teeth and remain in place throughout the treatment, typically for several months. Fixed functional appliances work by applying continuous forces to influence jaw growth and dental alignment, making them suitable for growing patients, often during adolescence. They can also be used alongside braces to achieve optimal results. However, post pubertal growth is essential, for effective treatment, especially in case of skeletal modifications along with dentoalveolar compensation.