Tooth enamel, calcium. Nail enamel, Biotin.
calcium
Enamel is not an element. The enamel of teeth is made primarily of the mineral hydroxyapatite (96%), water and organic material. As for enamel used in art or on floors, there is no standard for its' composition but it too is a compound.
Calcium builds strong bones and teeth. Fluoride increases strength of enamel.
Fluoride.
Ca is a prominent element in hydroxyapatite crystals that is enamel.
Yes, you'll need a lot, specially when young, needed for e.g. strong bones.
The enamel that covers the teeth is the strongest substance in the body. The dentin that lays just under the enamel is the second strongest substance in the body, even stronger than bone itself.
Milk
The elements needed for strong bones and teeth are Calcium, Magnesium, Phosphorous, and Fluoride. Milk is a good source of these elements.
Enamel, it is the hardest substance in the human body.
Fortunately for us the enamel coating our teeth is exceedingly strong
Healthy teeth should NOT be brittle. Instead, they should have healthy enamel. A thick enamel makes teeth strong and bright white. Teeth without enough enamel look off-white or gray, and can become brittle. This lack of enough enamel can lead to tooth weakness, cracking, and breakage.