retard
rides a short bus to school
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tbh its been a while since I made a post like this so here u go
Its pretty well known in any PSL/mewing circle/breathing-focused orthodontics that mouth breathing causes the facial bones to grow differently opposed to if not mouth breathing, however it really made no sense from a cause and effect standpoint why mouth breathers would be more recessed/downgrown compared to another person who isn't mewing but not mouth breathing, as the only difference is the jaw is slightly more depressed in the mouth breather group, compared to the non-mouth breathing non-mewing group, yet their faces will develop in such drastically different ways despite only a very slight change in growth variables (factors that will lead to different growth variants, tongue thrusting = flared incisors for example)
Even the people who made this info mainstream (The Mews) have practically no info regarding this, they just say the facts/evidence, however the mechanisms are no where to be found. I have thought about this for a long time and have came up with other theories that I later debunked, but I think this one might finally be legit.
Remember nearly all facial growth is dictated by forces, these forces act upon the sutures and generate growth based on the given force
Since there is no difference in force output from the mandible acting upon the maxilla itsself, (jaws arent touching when mouthbreathing), the only variable to look at are the muscles, and the forces they induce on the surrounding facial bones.
Another point, muscles are elastic, and the origin and insertion (muscle attachments) exert inverse forces upon each other. (When chewing, the temporalis muscle elevates the jaw, but the muscle also applies a downwards force on the temporal bone where the muscle attaches.)
Here is the medial pterygoid muscle: (its the vertical larger one)
The muscle attaches on the mandible (obviously) and originates from the maxilla. Since muscles are elastic, whenever the jaw is depressed, the mandible rotates both downwards and backwards, and the muscle is being "stretched" similarly to a rubber band, this elastic force is pulling the maxilla both downwards and backwards (the lateral pterygoid does the same as well, just much less signficantly).
This elastic force acting upon the maxilla is essentially a "reverse facepuller," instead of pulling the maxilla forward and upwards, it pulls the maxilla down and backwards creating faces lacking forward any forward growth, with significant vertical growth. (again explaining why mouthbreathers end up with destroyed faces and non mewing non mouthbreathers will generally grow much more typically)
Here is my scuffed asf drawing of this - the mandible is rotated backwards and downwards due to the mouth breathing, this increases the space between the pterygoid muscle's origin and insertion (the mandible to maxilla) - the muscle acts the same way as stretched rubber band would since they are both elastic, when the distance between the two points is increased, the elastic force between the attachment points are as well. This force for many unfortunate souls recesses their maxilla all the way down to Subhumanistan, as these poor souls essentially are reverse facepulling their entire life
a question that will probably be asked - "but if the muscle when activated (jaw elevated), the same force downward and backward force is still applied, and probably even stronger"
this is true but in this situation, the jaw being elevated itself pushes upon the maxilla at a much greater magnitude than the muscle is pulling the maxilla back at (since there are other muscles like the masseter and temporalis that also elevate the mandible without applying a downward + backward force on the maxilla (only the pterygoid muscles do this, as they are the only ones attached to the maxilla)
Its pretty well known in any PSL/mewing circle/breathing-focused orthodontics that mouth breathing causes the facial bones to grow differently opposed to if not mouth breathing, however it really made no sense from a cause and effect standpoint why mouth breathers would be more recessed/downgrown compared to another person who isn't mewing but not mouth breathing, as the only difference is the jaw is slightly more depressed in the mouth breather group, compared to the non-mouth breathing non-mewing group, yet their faces will develop in such drastically different ways despite only a very slight change in growth variables (factors that will lead to different growth variants, tongue thrusting = flared incisors for example)
Even the people who made this info mainstream (The Mews) have practically no info regarding this, they just say the facts/evidence, however the mechanisms are no where to be found. I have thought about this for a long time and have came up with other theories that I later debunked, but I think this one might finally be legit.
Remember nearly all facial growth is dictated by forces, these forces act upon the sutures and generate growth based on the given force
Since there is no difference in force output from the mandible acting upon the maxilla itsself, (jaws arent touching when mouthbreathing), the only variable to look at are the muscles, and the forces they induce on the surrounding facial bones.
Another point, muscles are elastic, and the origin and insertion (muscle attachments) exert inverse forces upon each other. (When chewing, the temporalis muscle elevates the jaw, but the muscle also applies a downwards force on the temporal bone where the muscle attaches.)
Here is the medial pterygoid muscle: (its the vertical larger one)
The muscle attaches on the mandible (obviously) and originates from the maxilla. Since muscles are elastic, whenever the jaw is depressed, the mandible rotates both downwards and backwards, and the muscle is being "stretched" similarly to a rubber band, this elastic force is pulling the maxilla both downwards and backwards (the lateral pterygoid does the same as well, just much less signficantly).
This elastic force acting upon the maxilla is essentially a "reverse facepuller," instead of pulling the maxilla forward and upwards, it pulls the maxilla down and backwards creating faces lacking forward any forward growth, with significant vertical growth. (again explaining why mouthbreathers end up with destroyed faces and non mewing non mouthbreathers will generally grow much more typically)
Here is my scuffed asf drawing of this - the mandible is rotated backwards and downwards due to the mouth breathing, this increases the space between the pterygoid muscle's origin and insertion (the mandible to maxilla) - the muscle acts the same way as stretched rubber band would since they are both elastic, when the distance between the two points is increased, the elastic force between the attachment points are as well. This force for many unfortunate souls recesses their maxilla all the way down to Subhumanistan, as these poor souls essentially are reverse facepulling their entire life
a question that will probably be asked - "but if the muscle when activated (jaw elevated), the same force downward and backward force is still applied, and probably even stronger"
this is true but in this situation, the jaw being elevated itself pushes upon the maxilla at a much greater magnitude than the muscle is pulling the maxilla back at (since there are other muscles like the masseter and temporalis that also elevate the mandible without applying a downward + backward force on the maxilla (only the pterygoid muscles do this, as they are the only ones attached to the maxilla)