Why do our milk teeth fall out? Detailed answer

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Why do our milk teeth fall out? Detailed answer

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Why do our milk teeth fall out?

All creatures on earth have teeth, be it a man, a cow, a horse, a dog, a cat or a mouse, but they all have precisely such teeth that best suit their lifestyle, way of eating and character in general.

In lower vertebrates, several changes of teeth occur during their life. For example, in a shark, fully grown and worn teeth simply fall out, like hair in mammals, and are replaced by new ones. Higher animals have fewer teeth, and the ability to grow new ones is more limited. A person's teeth change once in a lifetime - when his milk teeth fall out and new ones grow in their place.

As a result of evolutionary development, a person is at a stage when his teeth change only once. A human baby is born toothless. After six months of life, the first tooth appears in the middle of the lower jaw. Over the next two years, he grows twenty teeth. They are called milk teeth. Beneath them sits the second set of teeth, which begin to erupt after the age of six, and gradually, between six and twelve years of age, replace the milk teeth.

In addition, three more teeth, called molars, appear on both sides of each jaw in the depths of the mouth. Thus, in an adult, instead of twenty milk teeth, thirty-two teeth appear. A person is also characterized by what is called a "full set of teeth", that is, he has different types of teeth: incisors, canines, small molars and molars - all appear one next to the other. And they are all the same height and arranged in even rows.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

What are the largest waterfalls in the world?

A waterfall is a stream of water that suddenly falls from a height to a lower level. If the volume of water is small, the waterfall is called a "cascade", if it is large - a "cataract". Some waterfalls fall from a height of hundreds of meters in a single narrow stream. Others are known for their width, or for the sheer amount of water that spills over the ledge.

Here are some of the biggest waterfalls in the world: Angel Falls in the Guiana Mountains in Venezuela - the largest in the world (980 m) with the longest continuous fall of 807 m. The falls were discovered in 1935 by American aviator James Angel. The longest waterfall in Asia is Gersoppa Falls in India. It is a cataract falling over four ledges, with a total length of 252 m. The waterfall through which the largest amount of water passes is Guaira, on the border of Brazil and Paraguay. It carries over 13 cu. m of water per second and consists of 309 separate waterfalls with a total drop height of about 18 m.

One of the highest in the world is Ribbon Falls in Yosemite National Park in California. It is a narrow stream of water falling from a 490 m high cliff into the Merced River. The second largest waterfall in the world was found in South Africa. This is Tugela Falls. Water falls from a height of 853 m in five stages.

And, of course, among the most famous in the world - Niagara Falls. It is located on the Niagara River, 25 kilometers from the city of Buffalo, New York. In fact, Niagara Falls consists of two cataracts - the Horseshoe (or Canadian Falls) and the American Falls. The border between Canada and the United States runs through the center of the Horseshoe Falls. About 94 percent of the Niagara River's water, approximately 37 liters, overflows the Horseshoe Falls every minute.

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