Have you already closed your child’s four newly grown teeth that will last a lifetime? Don’t let your child blame you when he/she grows up, you have a big responsibility. Tooth decay can be prevented by closing the fissure. The best time to close the fissure is at the age of 6-8 weeks. I. What are six-year-old teeth? When the baby is 6 years old, the mother can observe the teeth erupting at the very back of the baby’s dental row, i.e. behind the second molar, which is the first permanent molar. The first permanent molar begins to form around 3-4 months of embryonic life, starts to calcify at birth, and the crown calcification is completed around 2-3 years old. II. What is a fissure closure? The newly erupted “six-year-old teeth” are not very strong, the unpolished occlusal surface is uneven, and the sulcus is deep, so it is easy to accumulate food residues and plaque, and it is not easy to clean them, so they are eroded by the acid produced by bacteria, and it is easy to have caries. Many mothers and fathers will take their babies to the dentist, and the doctor will suggest to apply a layer of resin material on the sulcus point gap on the surface of the sixth age teeth to stop the erosion of cariogenic bacteria and acid metabolites to the teeth for the purpose of caries prevention. So you can use the method of sulcus closure to fill the deep sulcus on the occlusal surface before the occurrence of caries, so that the food residue and plaque are not easy to accumulate and achieve the effect of caries prevention. The method of sulcus closure: it is completed by several steps of cleaning teeth, acid etching, rinsing and drying, applying sealant and curing. When the material is cured and closely bonded to the wall of the sulcus, it has a certain anti-chewing pressure, so there is no obstacle for the baby to eat. The cured material is not toxic and does not cause harm to the body. The sign of successful closure is that the sealant can exist intact and can wear out but not fall off, so mom and dad need to check the baby’s teeth regularly and re-seal them if the material falls off. Third, the sixth age teeth “hard work”, the rate of decay is also high 1, non-replaceable “sixth age teeth” is about 6 years old eruption of four large teeth, is the medical called the first permanent molar (along with the teeth of a lifetime). Because it is the first molar to erupt, many mothers and fathers will mistake it for milk teeth and think it can be replaced, so they do not pay attention to its decay and do not actively treat it, resulting in serious decay and early loss. Keep in mind that six-year-old teeth can not be replaced. 2.Keep the normal facial development Because the root of the sixth age tooth has a large bifurcation angle and is especially strong, so it is the strongest in the permanent teeth. Moreover, it has the largest crown, the most cusps, and the widest chewing area, and the biting force and chewing function are greater than other permanent teeth. In addition, the six-year-old teeth are located in the middle of the entire dental arch, becoming the main pillar of the dental arch, which is important for maintaining the normal alignment of the upper and lower jaw teeth, maintaining the correct occlusal relationship and ensuring the normal development of the jaw and face. 3, the strongest chewing ability Four six-year-old teeth will become the first permanent teeth in the baby’s life after eruption, they are the largest biting surface area of a tooth, just like a stone mill, play a big role in grinding food. However, they are also under the most pressure to chew. At the same time, they have many cusps and many sockets between cusps and cusps, and they are deep and narrow, which are easy to hide stains and caries, and even cause premature loss. They are “hard-working” teeth. So mom and dad must help baby to protect them well. 4, easy to occur caries, induce systemic diseases In the process of baby’s growth, their main oral disease is caries, according to the statistics of 12-year-old children’s permanent teeth caries rate is 29%, and 60% of the caries occurred in the first permanent molar (that is, six-age teeth). Once the sixth-age teeth are decayed, the pain caused by it will affect the baby’s appetite and also affect the chewing and digestive function, which will adversely affect the baby’s growth and development. If tooth decay is not treated in time, it will also cause pulpitis, alveolar abscess, jaw bone osteomyelitis, etc. Seriously, it will also induce rheumatoid arthritis, heart disease, nephritis, endocarditis and other systemic diseases. Therefore, it is very necessary to prevent the caries of “six-age teeth” during the caries-sensitive period, such as 5-9 years old, in order to prevent the future dental diseases. Mom and dad must keep this gate for baby. 1.Pay attention to dental hygiene Generally, when babies are 2 years old, they should start to teach them to rinse their mouth after meals and brush their teeth in the morning and evening. Let them develop a good habit. When the baby is about 3 years old, then gradually teach the baby the brushing method of “brush the upper teeth down, brush the lower teeth up, brush inside and outside, and don’t forget the biting surface of the teeth”. 2.Regular examination As a mother, we should pay more attention to the two or three years after the baby’s teeth erupted, we should try to do an examination once every six months, to find out the cavity, fill it immediately, don’t let the cavity expand, to achieve timely prevention, timely detection and timely treatment. 3.Timely repair the caries If the baby has serious caries and the tooth pulp has necrosis, don’t make the decision of extraction easily, if possible, ask the doctor to do the root canal treatment and then keep it, if the tooth is damaged seriously, use the metal crown to repair it. If you can’t keep it, you should get a denture as soon as possible after extraction to fill the missing teeth, and you should listen to the doctor’s advice. 4, for the “six-year-old teeth” wear “protective clothing” because the “six-year-old teeth” eruption earliest, the fissure of the sulcus of the tooth surface is more, the degree of mineralization is poor, food is easy to retain. If the baby does not develop good brushing habit and likes to eat sweets and snacks, then this tooth is most likely to have caries. Therefore, we should take good care of the “six-year-old teeth”. If the “six-year-old teeth” are not yet decayed, take the sulcus closure and put on the “protective coat” to prevent the decay.