What causes a wide jaw (jaw and maxilla development)

Ajouté : 2026-05-24

[00:00:05]Apparently, the reason your jaw is cooked is because you didn't mew as a baby. Meanwhile, ancient skulls have wide palates and straighter arches, even though they didn't have orthodontists.

[00:00:16]So, either they were all secretly running a mewing tribe, which is funny because they didn't even know what mewing was, or maybe, just maybe, something changed in development. In this video, we're going to be looking at why many of them developed wide jaws, why some people today still have wide jaws without ever thinking about this stuff, and I'm also going to explain why ancient skulls prove mewing is a lazy argument. When people show ancient skulls, they're basically pointing at three things: wide dental arches, wide palates, and less crowding. Then, they make the claim, "That must be tongue posture." But, no.

[00:00:55]Ancient skulls are proof that the default development was different. But, here's the thing people in this space ignore. Yes, many pre-industrial skulls show broader arches and less crowding, but it wasn't universal.

[00:01:08]There are documented prehistoric populations with real crowding and malocclusion, too. There's a study on a Copper Age sample, which found incisor crowding across adult mandibles they analyzed. So, I'll admit the "ancients had perfect teeth" claim is exaggerated.

[00:01:25]My point is the trend changes with lifestyle, and the data gets really interesting when you look at the transition periods.

[00:01:32]And one of the most important clues is what happened when humans shifted from hunting and gathering into agriculture.

[00:01:41]When studies compare jaw and dental dimensions across groups spanning pre-agriculture through farming periods, there are clear differences in mandibular form between hunter-gatherers and farmers, with the fit between teeth and jaw form looking more stable in hunter-gatherers than in farming groups. So, even thousands of years ago when diets shifted, mouths started shifting. That matters because it tells you this isn't some posture mystery.

[00:02:10]So, when we look at breathing, if a kid can breathe through the nose easily, the mouth can stay closed, tongue posture tends to be more stable, and facial growth patterns are more likely to stay on track. On the other hand, if the kid has chronic nasal obstruction, what happens? They compensate. They start to mouth breathe. And chronic mouth breathing in children is associated with a cluster of changes often described as adenoid facies, including things like narrow dental arches and altered facial growth patterns. This creates a feedback loop. The mouth stays open, the cheeks put pressure on teeth, the jaw drops back, and the face grows long instead of wide. But, not every mouth breather gets the same face.

[00:02:55]Genetics still matters. But, it's not woo. There's a real clinical conversation here. Airway obstruction, oral posture, muscle function, and growth are connected. So, when you look at ancient skulls and think they had wider faces, the default was nasal breathing.

[00:03:13]The irony is, if everything is working normally, you don't even notice it. So, you don't call it mewing.

[00:03:21]It's just your body developing like it was supposed to. I'm sure some of you watching this didn't need any orthodontic intervention. Weston Price gave us a useful clue because he was asking the same questions. Why are mouths changing? Why is crowding increasing? And what he noticed was that when groups shifted away from their traditional nutrient-dense diets and lifestyles into modern foods, they saw more crowding and poorer development within the very first generation. He realized that building wide bones require massive amounts of fat-soluble vitamins.

[00:03:53]And even if you don't worship every conclusion, that core question is the same. If mouths were generally more robust, and then we industrialized, what exactly changed? That's the root cause mindset.

[00:04:06]Unless you want to say they just forgot mewing.

[00:04:09]Now, here's where people try to dunk on the development argument. Okay, genius, what about models and celebs with insane jaws?

[00:04:18]They didn't know about nutrition or airway. How?

[00:04:23]HOW?

[00:04:27]HOW?

[00:04:28]I don't inheritance obviously matters. Some people start with a broader craniofacial base. That's life.

[00:04:38]And second, you don't need to be aware of development for development to happen. Some people got strong genetics, grew up eating real food more often, and didn't have years of mouth-open compensation. And that's exactly why mewing is such a weak explanation. These people still developed great faces.

[00:04:57]But one thing you'll notice is that their kids may end up having narrower jaws than them. Some of them end up needing braces or getting their wisdom teeth taken out. If you want the root cause conversation, you look at what changed. At some point in modern history, orthodontics and braces go from being rare to being normal.

[00:05:16]This clearly shows that narrower arches became common enough that an entire industry scaled to meet it. If ancient skulls show wider arches, and then we hit an era where braces become normal, what changed between those eras? And when you combine that with the airway story, suddenly the why now?

[00:05:36]question stops being mysterious.

[00:05:38]So, if you're watching this because you know someone with a wide jaw who never mewed or doesn't even know what mewing is, here's my answer.

[00:05:46]They either had a wider baseline template, better development conditions as a kid, or both. That's it. Wide jaws are usually the result, and the biggest jaw changes happen during growth windows.

[00:05:59]And I will do a follow-up video on chewing because people love to say it's because our foods have gotten softer, or just chew hard foods and your jaw will grow. If this video was helpful, hit like.

[00:06:12]If you didn't like it, hit the dislike.

[00:06:14]Let me know what I missed in the comments, and thanks for watching.