Why Do Humans Only Replace One Tooth?

Tooth Verse: Don't worry about the number of replacements, one tooth and one permanent tooth are very reliable.

I often watch dentists be happy, love it and don't bother.

Teeth: This boxing is really fierce!

Tooth: Hey, be careful not to knock out your teeth.

Tooth: Huh? Isn't it possible that the boxer's mouth has a 'mouthguard' to protect his teeth?

Tooth: Yes. The 'mouthguard' is also known as a protective guard, and it is frequently used in high-risk, high-impact sports competitions. Its main function is to protect our teeth and soft tissues such as lips and cheeks from injury during potential collisions. It can directly cushion the impact on the face and jaw, preventing tooth fracture, displacement, loss, or even alveolar bone and jawbone fractures. It can also protect the mouth's inner lips, cheeks, and other soft tissues from scratches and bites caused by sharp tooth edges.

Tooth: Oh, I remember that many athletes wear them, such as basketball, boxing, football, and hockey.

Tooth: Well, we can't lose teeth just because of sports, right?

Tooth: However, I also remember that weightlifters wear mouthguards, and they don't have direct confrontation with each other.

Tooth: This is another function of mouthguard—protection of the temporomandibular joint. Sports like weightlifting require sudden force, and athletes tend to clamp their teeth when exerting force. Long-term clamping of teeth can cause tooth abrasion, excessive muscle tension and excessive biting force will also transmit to the temporomandibular joint, which can cause temporomandibular joint dysfunction, and mouthguard can buffer the biting force, prevent excessive pressure on the joint, and thus protect our joint.

Tooth: Oh, I remember why humans replace one tooth every time? I remember that animals in the animal kingdom said that fish, elephants, etc., can replace many teeth.

Tooth: Fish mainly use their teeth to capture prey, without chewing function, the whole set of teeth are triangular or conical shape, called same type teeth

When teeth fall out, new teeth will supplement, lifelong without stopping, it can be called multi-teeth row; this teeth have no roots, rely on fiber attachment to jawbone, called direct-attached teeth. Two-lived animals resemble amphibians and fish, but have fewer teeth. Reptiles have teeth concentrated on the upper and lower jaws, which have a complete root system called socket-attached teeth. Mammals have evolved into specialized teeth (incisors, canines, molars), the number of teeth is significantly reduced, and the roots are deeply embedded in the jawbone, and they only replace teeth once in a lifetime, which is called two-teeth row.

Tooth: I said that the teeth fell out without roots!

Tooth: Of course, when the permanent teeth erupt, they may erupt in the position of the milk teeth, forming the situation of milk teeth and permanent teeth coexisting—'double-row teeth'. It is best to go to the medical institution for examination as soon as possible, usually need to remove the remaining milk teeth to create conditions for the permanent teeth to return to the original position.

Tooth: I remember this, tooth lady said it before.

Tooth: Haha, tooth brother is very good.

Tooth: 6-year-old teeth are the first permanent molar, and the second milk teeth are about to be replaced at 30 months old.

Tooth: But around 6 years old, the first permanent molar will erupt, which is called six-year-old teeth.

Tooth: At 6 years old, the permanent teeth will be replaced one by one until about 14 years old, so this period is called the replacement period.

Tooth: The permanent teeth are generally in the position of milk teeth roots, and as the permanent teeth erupt outward, they will contact the milk teeth roots. The milk teeth roots will be gradually absorbed by the pressure, and when the milk teeth roots are basically absorbed, they lose their fixed ability in the interior of the bone, the milk teeth will fall off.

Tooth: I said milk teeth fall out without roots!

Tooth: Of course, there are also cases when permanent teeth erupt in the position of milk teeth, forming the situation of milk teeth and permanent teeth coexisting—'double-row teeth'.

Tooth: I remember this, tooth lady said it before.

Tooth: Haha, tooth brother is very good.

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