Why do we have crooked teeth when our ancestors didn't? A TED-Ed video explained
Video: TED-Ed (external content, rights belong to the creator; HK Dental Guide adds commentary only) Original video · TED-Ed 網站顯示近 490 萬次觀看（2026 年 9 月）
TED-Ed's animation "Why do we have crooked teeth when our ancestors didn't?", presented by G. Richard Scott, has nearly 4.9 million views on the TED-Ed site. It shows that fossil evidence points to ancient humans usually having straight teeth, and that crowding is a comparatively recent problem; the main explanation it offers links softer modern diets to how our jaws grow.
What it means for you
Many parents assume crooked teeth are purely inherited. This video looks at it through human evolution — and shows why checking bite and jaw growth early matters.
Editors' take: the background
The American Association of Orthodontists (AAO) recommends a first check with an orthodontist by age 7, while the jaws are still growing, because some problems — such as crossbites or a narrow upper jaw — can be addressed during growth. The AAO also stresses that many children only need monitoring after that visit, not immediate treatment.
To find an orthodontic specialist in Hong Kong, check the Dental Council of Hong Kong's specialist register. Our guides on children's braces and on choosing an orthodontist cover the rest.
Key points
- The video's view: ancient humans mostly had straight teeth; crowding became common recently
- The American Association of Orthodontists advises a first orthodontic check by age 7
- Not every child needs treatment straight away — some just need monitoring
Source: TED-Ed
This is a news summary written by our editors, not medical advice. Please refer to the original source and seek professional advice for your own situation.
Questions readers ask
Does my child need braces at 7?
No. The AAO says age 7 is a good time for a first check; many children only need monitoring, not immediate treatment.
How do I know a dentist is an orthodontic specialist?
The Dental Council of Hong Kong publishes a specialist register listing registered orthodontic specialists.
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