What is the hardest part of the human body?

The human body has many tissues and organs, and different parts have different roles and functions. Only when all parts of the human body cooperate and coordinate with each other can the human body function normally. In life, some people often think about which part of the human body is the hardest. Everyone has different opinions on this question. The bones, teeth and strong heart of the human body are all strong.

bone

The hardest tissue in the human body is definitely bone. In addition to flesh and blood, the human body also has bones, tendons, and organs such as the heart, liver, and lungs. If we classify them according to their hardness, bones are undoubtedly the hardest part. Some people say that the hardest part of the body is the fist. Some people's fists are very hard. After decades of practice, they may be able to break a stone slab with one punch. However, fingers are made up of bones. The human body relies on muscles and tendons to exert force, so the hardest part of the body is the bone.

teeth

The hardness of teeth is comparable to that of steel. Generally, healthy adults have 32 teeth, which are divided into incisors, molars, and dens. Why are teeth so hard? Because the outermost layer of teeth is covered with a layer of transparent crystals, this crystal is called enamel (also known as enamel). The enamel contains rich inorganic substances, with an energy content of about 97%. This inorganic substance is mainly hydroxyapatite, with a hardness of 7 to 8 degrees, which is more than ten times that of bone and ten times that of diamond.

Dental care

1. Brush your teeth once in the morning and once in the evening. When brushing your teeth, keep the brushing time within three minutes. It is recommended to brush your teeth three to five minutes after a meal. Do not use excessive force while brushing your teeth. The correct way to brush your teeth is to brush up and down.

2. Try to eat less sweets to prevent tooth decay, and eat more vegetables and fruits, which can enhance the disease resistance of the oral mucosa and have a mechanical brushing and friction effect on the teeth.

3. Tooth enamel is afraid of acid, so drink less carbonated drinks. Use a mouthwash that contains fluoride every three days. Mouthwash can penetrate deep into the gaps between teeth where toothpaste cannot reach, and remove tartar and plaque. But there is no need to use too much, rinse thoroughly after brushing with mouthwash.