09/17/2026
Open Mouth Posture: Symptoms vs. Effects
Week 2 of our series on orofacial myofunctional disorders! This week: resting with an open mouth — something so many of us do without even noticing, but it's telling you a lot about what's happening with your muscles and airway.
The Symptoms (what it looks like)
• Lips parted at rest, even when not talking or eating
• Jaw hanging slightly open, especially when tired or focused
• Tongue resting low in the mouth instead of up against the palate
• Breathing through the mouth instead of the nose without noticing
The Effects (what it costs you over time)
• Dries out the mouth, raising the risk of cavities and gum disease
• Makes nasal breathing even harder to re-establish over time
• In kids, can influence jaw growth, facial development, and tooth alignment
• Linked to poor sleep quality and daytime fatigue
A resting mouth should be closed, with lips together and the tongue resting on the roof of the mouth — not hanging open. If you notice this in yourself or your child, it's worth asking why.
That's the root-cause approach we take at Siesta Myo. Curious if open mouth posture is affecting you or your family? Send us a message to book a guidance call.