Human BodyMuscles
Enamel is the hardest thing your body makes and it never grows back.
Every other tissue you have repairs itself. Teeth get exactly one shot.
Source
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More human body facts
Human body facts about the one you are sitting in. Roughly 8% of your DNA came from ancient viruses, you almost certainly have mites living on your face, and a newborn can breathe and swallow at the same time. Every fact links to the reference behind it.
- About one person in seven is missing a forearm muscle.
- One bone in your body touches no other bone.
- Bone is stronger than concrete.
- Babies have no kneecaps in the usual sense.
- Babies are born with 300 bones and lose nearly 100 of them.
- The tiny muscles that raise goosebumps are useless for warmth on a nearly hairless animal, but they anchor the stem cells that grow new hair.