Book a 1:1 With Bill
(Dentists Only)

Is a community of clinicians, founded by Dr. Bill Hang, who is passionate about preventing and treating airway disorders in patients from 3 years of age and on.

Through our mentorship programs, Dr. Hang teaches pediatric dentist, orthodontists and general dentists to identify and treat airway disorders so that your patients don’t suffer from undiagnosed sleep and airway disorders.

Enrollment for 2025-2026 E.C.H.O. Mentorship is now open

Mentorship in Airway-Centered Pediatric Orthodontics

Whether you’re managing early childhood airway issues through E.C.H.O. or addressing extraction retraction regret in teens and adults with E.R.R.S., our mentorship programs offer personalized guidance, expert training, and real-time case support.

Join a community dedicated to mastering airway-centered orthodontics at every stage of life and elevate your approach to patient care.

Why Is This Important?

25 – 40% of young people

have sleep problems.*

60 – 70% of children with ADHD

have mild to severe sleeping problems.*
25 million adults in the U.S.
are affected by sleep apnea.*
11-12 million adults in the US

suffer from TMJ pain.* 

Hear From An E.C.H.O. Member

Watch Full Video

Two Mentorships with William M Hang DDS MSD

Treating Children 3 to 10 years of age?

Learn to help your youngest patients achieve a healthy and long lifespan by becoming a member of the Early Childhood Health-centered Orthodontics™️ (E.C.H.O.) Mentorship.
E.C.H.O.: Learn How To Treat Children

Treating Teens or Adults?

Learn to prevent and treat E.R.R.S.™️ for teens and adults. Become a member of the E.R.R.S.™️ Mentorship and help your patients who are coping with Extraction Retraction Regret Syndrome™️.
E.R.R.S.™: Learn How to Treat Adults

Greg Campi
DMD

Wall, New Jersey

"ECHO: As an orthodontist I feel there is no orthodontic system that can achieve the great health results of orthrotropics®️."

"ECHO: As an orthodontist I feel there is no orthodontic system that can achieve the great health results of orthrotropics®️."

Neil Stevenson
DMD

Jacksonville, Florida

"He [Dr. Hang] tells us not to be afraid. We all want to help people but we are afraid of failure and he encourages us to just move forward to help our patients. That's where we are going to learn
"He [Dr. Hang] tells us not to be afraid. We all want to help people but we are afraid of failure and he encourages us to just move forward to help our patients. That's where we are going to learn and grow."

Mark Kogut
DDS, MSD

Dallas, Texas

"I think the most important thing that any student would learn in this particular mentorship is that airway is a big deal. Dr Hang has a number of ideas to help with that. He shares his successes and treatments that
"I think the most important thing that any student would learn in this particular mentorship is that airway is a big deal. Dr Hang has a number of ideas to help with that. He shares his successes and treatments that are not as successful and I think we can learn from both of those."

Ksenia Pushkina
Orthodontist

Moscow, Russia

"...being in the community of doctors and community with Dr Hang. His relationship between him and his students - you feel like you're in the family! If you think this mentorship will change your practice, no. It will totally change
"...being in the community of doctors and community with Dr Hang. His relationship between him and his students - you feel like you're in the family! If you think this mentorship will change your practice, no. It will totally change your life."

Marc Purdy
DDS

Ithaca, New York

"The more you see, the more you hear the different types of scenarios is what helps you gain a better background. You go through your own career and never hear any of this and come across something and not really
"The more you see, the more you hear the different types of scenarios is what helps you gain a better background. You go through your own career and never hear any of this and come across something and not really know how to treat it. This (the E.C.H.O. Mentorship) gives you certainly the basics to do something like that. It kind of circulates through me now."

Kevin Adair
DDS, MSD

Fairfield, California

“You are going to meet some great doctors, I call them the 1%. Being in the study club is going to open you up to these other team members and resources. It’s going to make you better.”
“You are going to meet some great doctors, I call them the 1%. Being in the study club is going to open you up to these other team members and resources. It’s going to make you better.”

Victor Avis
DDS

Staten Island, New York

“If you’re doing orthodontics, the study club will change your life. We are using orthodontics to change the quality of a person's health. What an exciting time to be in this field. Instead of being a ‘tooth straightener’, you can

“If you’re doing orthodontics, the study club will change your life. We are using orthodontics to change the quality of a person's health. What an exciting time to be in this field. Instead of being a ‘tooth straightener’, you can be part of the team of providers that changes patients lives.”

  1. 25-40% of young people have sleep problems.
    Asarnow, Lauren D, and Riya Mirchandaney. “Sleep and Mood Disorders among Youth.” Child and Adolescent Psychiatric Clinics of North America, U.S. National Library of Medicine, Jan. 2021.
  2. 60-70% of children with ADHD have mild to severe sleep problems.
    Vaidyanathan, Sreelakshmi, et al. “Sleep Disturbances in Children with Attention – Deficit/Hyperactivity Disorder (ADHD): Comparative Study with Healthy Siblings.” Journal of the Canadian Academy of Child and Adolescent Psychiatry = Journal de l’Academie Canadienne de Psychiatrie de l’enfant et de l’adolescent, U.S. National Library of Medicine, 2016.
  3. 25 million adults in the US are affected by sleep apnea.
    Kingshott, Ruth. “Rising Prevalence of Sleep Apnea in U.S. Threatens Public Health.” American Academy of Sleep Medicine – Association for Sleep Clinicians and Researchers, 7 Nov. 2017.
  4. 11-12 million adults in the US suffer from TMJ pain.
    “TMD (Temporomandibular Disorders).” National Institute of Dental and Craniofacial Research, U.S. Department of Health and Human Services,  Accessed 26 Oct. 2023.

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Wait List for the E.C.H.O. Mentorship Spring 2026