- mouth not wide enough
- Roof of mouse rise up instead of out
- High arched palate
- Shrinks nasal cavity, disrupting delicate structures in the nose
- Instruction of airflow
- Bacteria replicates and lead to infections and colds
- Habitually mouth breath
5400 mammal species, only humans have misaligned jaws, overbites, underbites, snaggled teeth
mashing and cooking food → more calories → larger brain → took space from front of face → shortened face, weakened jaw, shrank mouth, vertical nose
Larynx sank lower → more space in the back of mouth → wider range of vocalization → voice communication, but easier to choke, snore
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