“The Cause of Malocclusion” by John Mew presents a groundbreaking perspective on dental malocclusion, arguing that it is primarily a “postural deformity” stemming from environmental factors rather than genetics. The book champions “Orthotropics,” a philosophy and treatment approach focused on guiding natural facial growth by correcting oral posture, especially tongue position and lip seal. It details the Biobloc appliance system as a non-extraction, non-surgical method designed to achieve stable, aesthetically pleasing dental and facial results, particularly emphasizing the benefits of early intervention. The text critiques traditional orthodontic practices for often addressing symptoms over root causes and potentially contributing to adverse facial changes. This comprehensive guide is intended for dental professionals, students, and parents seeking to understand and implement natural facial growth guidance.