Myofunctional therapy, also known as orofacial myofunctional therapy, is a specialised approach for diagnosing and preventing muscle dysfunctions in the oral and facial areas. It addresses disorders affecting the mouth, lips, tongue, teeth, and jaw, often arising from irregular jaw growth, tooth misalignment, or temporomandibular joint issues. 

This therapy emphasises the intricate relationship between oral functions, such as chewing, swallowing, talking, and laughing, and their impact on overall health.

Beyond malocclusion caused by abnormal muscle functions, myofunctional therapy extends its reach to various fields, including facial malformations (e.g., cleft lip and palate), congenital syndromes (e.g., Down Syndrome), cerebral palsy, stroke, traumatic brain injuries, degenerative and neurological disorders, and postoperative treatments. 

The intervention methods range from active patient participation in exercises to passive approaches using custom-made Function Generating Bite (FGB) devices.

The development of myofunctional appliances, specifically Function Generating Bite (FGB) devices, marks a significant advancement in orthodontics. FGBs, like the bionator, have evolved since the early 20th century, aiming to modify jaw positions and correct bite issues. 

These appliances, designed for both active growth phases and adult treatments, offer effective solutions for malocclusions, temporomandibular joint disorders, and bruxism. The FGB's impact on guiding growth and improving muscle function positions it as a valuable tool in orthodontic care.