Unknown facts about teeth
Teeth consist of hard fabrics, their main purpose - the mechanical processing of food. They participate in the process of sound formation, so the absence of one or more can lead to a deterioration in the diction. A beautiful smile is impossible without even white teeth.
Ancient dentists
The first evidence of dental implant operations was discovered during the study of ancient Egyptian pharaohs. In their jaw were inserted other people's teeth. Historians say that after the famous Battle of Waterloo, the teeth of the dead were sent to many countries, which were used for implantation.
In the Etruscans and ancient Egyptians, archaeologists in the jaws find the turned bones of animals. Other peoples used a tortoise shell for prosthetics. The most interesting finding of scientists is the jaw of the ancient Inca with 32 teeth made of quartz.
The most expensive in the history of mankind was Newton's tooth, it was sold in the XIX century for a sum equivalent to today's 40 thousand dollars. The lucky owner of the rarity inserted it into the gold ring.
A visit to the dentist is inevitable.
Elephants have their teeth changed regularly throughout their life, they grow again 9 times in 60 years. In sharks, they grow in proportion to erasure. The person in this respect is unlucky, the replacement of milk teeth by permanent takes place only once. In the future, they are not restored, if you contact the dentist in a timely manner, the patient's tooth can be repaired, in advanced cases it is necessary to make artificial limbs.
Hippocrates believed that the teeth of children are formed from mother's milk, so he called them dairy. They are not as strong as permanent, with a thinner layer of enamel. Their condition is strongly influenced by the baby's nutrition. Normal growth is impossible without the calcium contained in the milk.
The strongest muscles are the chewing muscles of
. Human chewing muscles are not inferior in strength to the grasp of the fighting breeds of dogs. The maximum pressure can reach a value of 3.5 centners, which can damage the enamel and the teeth themselves. Average daily indicators of the jaws usually do not exceed 10-15 kilograms.
Strength
Scientific studies have shown that human tooth enamel has the same structure as that of a shark. It is the most durable of all body tissues, the hardness and strength it gives to calcium compounds. Enamel consists of crystals of hydroxyapatite, combined with organic proteins. This structure provides resistance to aggressive environment and prevents the appearance of cracks.
Salivary glands
They work in a continuous mode, for a day about 2 liters of saliva containing bactericidal substances are released. It is necessary for moistening the tooth surface and maintaining the acid-base balance. If the food is a lot of acid, alkali, then there is increased salivation, which helps protect the enamel from destruction. If the function of the glands is broken and saliva is not enough, then in 2-3 years, complete destruction of the teeth can occur.
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