The receipts
The evidence stacks up.
Over a century of research into how we breathe.
Front. Public Health
The impact of mouth breathing on dentofacial development
Lin et al., 2022
BMC Oral HealthMouth breathing & facial skeletal development in children
Zhao et al., 2021
Int. Dental J.Facial soft-tissue morphology in nasal- vs mouth-breathers
Cheng et al., 2023
Braz. J. ORLMouth breathing & facial morphological pattern
Bianchini et al., 2015
3D ScanningInfluencing factors on facial development in mouth-breathing children
2025
AnthropometryThe effect of mouth breathing on facial anthropometry
2024
StudySleep quality & nasal breathing
Study
Airway resistance and daytime focus
Study
Nasal vs oral breathing in athletes
Study
Mouth taping & overnight oxygenation
The receipts
The science, on the table.
Every stat we show you in the quiz, pulled from the research and laid out card by card. Matched to who you are — by age, by sex, by what you care about most.
😴 Sleep
🧠 Mental performance
💎 Looks
📚 The studies
The papers behind the receipts — tap any card in the stack above to jump straight to its source here.
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The impact of mouth breathing on dentofacial development
Read the source ↗ -
Mouth breathing & facial skeletal development in children
Read the source ↗ -
Facial soft-tissue morphology in nasal- vs mouth-breathers
Read the source ↗ -
Mouth breathing & facial morphological pattern
Read the source ↗ -
Influencing factors on facial development in mouth-breathing children
Read the source ↗ -
The effect of mouth breathing on facial anthropometry
Read the source ↗ -
Sleep quality & nasal breathing
Read the source ↗ -
Airway resistance and daytime focus
Read the source ↗ -
Nasal vs oral breathing in athletes
Read the source ↗ -
Mouth taping & overnight oxygenation
Read the source ↗
Cards summarise published research and survey data for general education; some are directional illustrations, not medical claims. Sources are cited on each card.