Tooth protection shield – Vulval sealant The most simple and effective method to prevent dental caries – vulval sealant. It is a method recommended by the World Health Organization (WHO) to protect the newborn permanent teeth. It has been done for 100 years for children aged 6-9 years in developed countries and nearly 40 years in China. I. What is a sulcus closure? Molar fossa and grooves are deep, which are easy to accumulate food and bacteria, thus leading to tooth decay. Vulval sealant is a method to prevent dental caries by sealing the sulcus on the surface of the crown of the tooth with a sulcus sealant to protect the enamel effectively. The sealant is polymer bonding resin and glass ion cement, which is non-toxic, non-side effect and painless, and can protect the teeth from the erosion of bacteria and metabolic products, and prevent the caries in the sulcus effectively for a long time. In the past, due to the shortage of oral health care resources, people only recommended to do the closure of the first permanent molars (six-age teeth) of children aged 6-9 years old, in fact, the closure is applicable to all the milk teeth and permanent teeth with sockets and grooves on the surface of teeth, regardless of adults and children’s teeth are suitable for the closure of sockets. The characteristics of the gutter closure: 1. Powerful closure of the sulcus, so that microorganisms or bacteria can not invade. 2. 2.Release fluorine for a long time to strengthen the enamel acid resistance to prevent caries. 3.It can resist the harmful microorganisms. 4.Good bonding with tooth body, not easy to fall off. 4.Process of sealing: Step 1: Use special brush with special detergent to clean the teeth to be treated and remove the impurities and bacteria from the surface of the teeth and the fissure of the sockets. Step 2: Acid etching of the tooth to be protected, limited to the location to be closed, to enhance the retention of the sealant. Step 3: Drying of the tooth with a high velocity airflow to insulate the target tooth from moisture. Step 4: Apply the sealant to the area to be sealed and use special wavelengths of light to harden the sealant. Step 5: Check for abnormal protrusions and use a slow speed drill to level it out. The whole process is painless and more acceptable to the child.