Where does this come from, and can I check it?

Dense hydroxyapatite crystal mineral matrix protects inner dentin layers. The figure is taken from Encyclopaedia Britannica, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

Is this really a human body fact?

Yes. It sits on the Human Body shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

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The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.

Mondo Knows Facts

Tooth enamel is the hardest substance in the human body

Dense hydroxyapatite crystal mineral matrix protects inner dentin layers

Outer tooth enamel is composed of roughly 96 percent minerals, primarily crystalline calcium phosphate known as hydroxyapatite. This dense structural arrangement makes enamel harder than bone, protecting teeth against daily chewing forces and acid exposure.

Where this comes from

Encyclopaedia Britannica

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Tags: teeth, enamel, minerals

Tooth enamel is the hardest substance in the human body: the short answers

Where does this come from, and can I check it?: Dense hydroxyapatite crystal mineral matrix protects inner dentin layers. The figure is taken from Encyclopaedia Britannica, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a human body fact?: Yes. It sits on the Human Body shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.