When a child reaches the age of about 6, the teeth that erupt at the end of the tooth row, behind the second milk molar, are the first permanent molars, which are customarily referred to as the “six-year-old teeth” because they erupt around the age of six. It is well known that your permanent teeth will stay with you for the rest of your life. “The “six-year-old teeth” play a special role in the masticatory organs, and functionally speaking, they are the center of physiological action. It has a large crown, many cusps, a large chewing area, and the roots of the teeth have a large bifurcation angle and are particularly strong; and it is located right in the middle of the entire dental arch, becoming the main pillar of the arch, which is known as the “key to the jaws”, which is important for keeping the upper and lower jaw teeth in a normal arrangement, maintaining the correct occlusal relationship and ensuring the normal development of the jaws and face. This tooth is of great significance in maintaining the normal alignment of the upper and lower jaw teeth, the correct occlusal relationship, and the normal development of the jaw and face. “Sixth-age teeth are the earliest permanent teeth that erupt, and when they first erupt, their hard tissues are very thin, their fossae are not well developed, and they are poorly calcified. And, it erupted at the time in the children’s milk, permanent teeth in the period of alternation, some parents still think that “six-year-old teeth” is the future to replace the milk teeth, ignoring the requirements of oral hygiene of the child and the protection of the teeth, making it susceptible to caries, therefore, the protection of children’s “six-age teeth Therefore, the significance of protecting children’s “six-age teeth” is very important. The “six-year-old teeth” are permanent teeth, such as shedding or extraction resulting in permanent loss. Its early loss will not only greatly reduce the children’s chewing function, but also affect the development of the jawbone and cause the neighboring teeth tilt and the elongation of the teeth of the opposite jaw, resulting in disorders of the occlusal relationship, which has a very negative impact on the physical and mental health of children. Therefore, we should teach our children to be hygienic and clean from childhood, and to develop the habit of brushing their teeth in the morning and evening and rinsing their mouths after meals. If you find that the development of teeth is not normal or suffering from dental caries, you should do early treatment.