The crown of the tooth is covered by<u> the enamel</u>, the hardest substance in the body.
The hardest material in the human body is dental enamel, or the hard tissue that covers the outside of the tooth crown.
It is more mineralized and durable than bone and the most heavily mineralized bodily tissue.
Calcium phosphate, a hard mineral, makes up the majority of it.
Dentin is the layer that lies behind your enamel. It is created from mineral-secreting live cells. The pulp, the primary living component of the tooth, is located underneath the dentin.
Dental crowns are caps that are affixed to broken teeth.
When fillings are ineffective, crowns are utilized to preserve, cover, and restore the contour of your teeth.
Metals, porcelain, resin, and ceramics can all be used to create dental crowns.
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When union workers refuse to work due to bad work conditions, in other words due to contractual disagreements, this is called a strike.
Sometimes when the union is big and the work is important, such as air transport, such strikes paralyze the whole country.
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Answer:
how directly the rays of the sun hit a location.
Explanation:
The ozone layer that's exist on Earth's atmosphere reduce the amount of heat that get into the earth from the sun ray. Pollutants that humans made from our day to day activity could actually damage this ozone and reduce the amount of protection that it provide from the sun ray's heat. As a result, it resulted in high temperature that's abnormal to earth's environment.
Phenomenon like this could be the cause of several events such as melting ice in the north pole, burning forests, etc.
