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It is a pseudoscience. Orthotropics is a pseduoscience invented and marketed by John and Mike Mew (they're a father & son team). From what I can tell, they have been expelled from the British Orthodontic Society, which is the official medical association for orthodontists in England.

They've been peddling this bullshit for years apparently. Here's a letter/comment from an actual orthodontist in the British Dental Journal:

"During my 25-year career as an orthodontist I have lost count of the number of times Dr Mew has had his controversial views published in the BDJ. Now he has self-published a 354 page book which costs £140, and is of 'limited relevance to the general practitioner or dental student, but specialists will be able to reach their own conclusions..."
https://www.nature.com/articles/sj.bdj.2014.707



And another one....



"Since most orthodontists use functionals, and tongue exercises are likely to have no effect then one can only assume that he is doing the same as everyone else. The problem is that Mr Mew has a theory but nothing else to back it up. Therefore can I please ask of Mr Mew three things: 1) stop proclaiming how right you are, we get the message but I'm afraid it will be ignored until you, 2) publish the details of your orthotropic treatment so we can actually find out what it is, a suitable title would be Orthotropics a step-by-step guide (please don't suggest that I could join the London School of Orthotropics to find out) and last but by no means least, 3) publish some evidence that it works, a double blind clinical trail would be nice but even an audit of 50 sequential cases would do as a start. You may be able to convince a few non-sceptical individuals that you are right but most of us are not prepared to ask our patients to do tongue exercises when they are likely to have no effect and neither should you."
https://www.nature.com/articles/4813141

It's complete bs. They took some data and managed to mish-mash it into their pseudoscience. There is no legitimate field called "orthotropics"; they think they're being clever by trying to make it sound like orthodontics, which is an actual medical specialty.

It's Brandolini's Bullshit Asymmetry Principle unfolding right here on reddit; the amount of energy needed to refute bullshit is an order of magnitude bigger than to produce it.


UPDATE 1: They're trying to sell their book about their pseudoscience
https://webcache.googleusercontent.com/search?q=cache:P7RYiEagX6kJ:https://orthotropics.com/shop-item/cause-cure-malocclusion/+&cd=1&hl=en&ct=clnk&gl=us

UPDATE 2 I guess the video also serves to sell other books too. Could anyone check to see if the video poster has an Amazon Affiliate Program? I'm guessing the youtuber who posted the video gets some kind of monetary incentive to promote the books.

https://www.amazon.com/gp/product/1944177590/ref=as_li_qf_asin_il_tl?ie=UTF8&tag=stuf0e-20&creative=9325&linkCode=as2&creativeASIN=1944177590&linkId=8ccdb44081e1708db4301452701fba41

https://www.amazon.com/gp/product/1503604136/ref=as_li_qf_asin_il_tl?ie=UTF8&tag=stuf0e-20&creative=9325&linkCode=as2&creativeASIN=1503604136&linkId=eb09f87db04071d4214d5f122969841a

UPDATE 3 Dr. Felix Liao, the author of one of the books above, is a "holistic doctor"
Here's more about him

There's a reason why the video only lists these books; there are no real studies on this.

UPDATE 4 There's a similar if not the same pseudoscience called "orofacial myofunctional therapy." Actually reading the poorly designed studies, looking up the biases of the researchers, as well as the origins of the journal it was published in are extremely important to determine whether it's a pseudoscience or not. That... and also if they are trying to selling books, courses, memberships, or any other multi-leveling/cult marketing nonsense.

https://www.ncbi.nlm.nih.gov/pubmed/25279527

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4296637/pdf/dpjo-19-04-0094.pdf

I hope orthotropic treatment will just be more popular in the future.

I read this book:
https://www.amazon.com/dp/1503604136/ref=cm_sw_r_sms_awdo_t1_T3tHDb396JN6R

And I have a 4 year old so we are going to go see a dentist that practices orthotropic when he’s around 6.

I got a copy of the book & I’ve already shared it with some other of my mom friends. I feel like spreading the information is a start.