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Michael Fassbender has excellent oral posture
He is known for his large teeth, wide palate, and smile amongst the community of oral posture enthusiasts.
Broad palate, square arch, and proclined incisors (upper and lower) give this man a nice facial form.
His bones aren't giving off a super androgenic/robust MMA vibe either. His tooth position relative to his facial bones allow his jaw to project well. But notice his teeth DO project.
Still has a wide arch with canines almost level with incisors. The only time proclined incisors are problematic is when the arch is narrow. Why? Because the canines prevent the mandible from coming forward. But as the canines expand they become more level with the incisors, giving the arch a more square as opposed to triangulate shape (the shape of bimax).
Incisors need positive inclination the same way the arch needs canines to expand away from each other. All of this matters. But the point here is that oral posture not affecting jaw projection and facial appearance is absolutely false.
The question isn't whether posture affects appearance.
The question is whether posture can even be reached.
Interesting info showing arc flattening through palate expansion.
Forward maxilla = flat maxilla (not triangular). Forward maxilla = forward mandible due to the canines coming apart, allowing the mandible to protract forward and close the incisor gap/overjet.
Look at the more squared and flattened form through palate expansion
I wonder how any of this affects vertical height.