TL;DR - Dentist presents his theory on how to make your face "prettier", without understanding that his result makes men to appear more masculine - not just prettier.

Longer TL;DR

Most of us know, that being prettier will make your life easier. Humans evolved to believe prettier people are better than ugly thus de facto threating prettier people better than the rest.This certain dentist believes you can improve how your face looks by:

  1. Eating food that requires more chewing
  2. Chewing gum
  3. Keeping your jaw always closed (not too tight)
  4. Slightly pushing your mouth ceiling with your tongue all the time

Body

Additionally to the standard Tomassi/Suave Red Pill theory, there are some additional PUA theory out there. Lets look at Face and LMS theory (link). There is a whole channel dedicated to this, but I would like to focus on a specific playlist and a specific video.
In the video the dentist talks about jaw line and wide vs long faces. He explains why today we have longer and not wider faces, and proves (eh "proves") that we consider wider faces more attractive. He provides services to children, and encourages mature people to try and change their habits, because that will at least stop some degradation and in the long run improve the jawline.

I highly recommend watching this whole playlist - it includes some LMS theory, and is followed by the dentist's lecture.

Update:

It appears that this dentist is well known, and he has his own field called orthotropics. I would like to make it clear, I am not affiliated to him and simply thought this could help men look better.

Also, some are saying that this can be harmful to your jaws. I am no doctor, and my advice or this guy's advice should not be taken as doctors advice (even though he is one). If you choose to follow these steps - watch the whole video, watch some other videos of this doctor before even considering following them.

Also - it would not harm people in this reddit being more civil to one another.