Mercury photography

Many people use silver powder to fill their teeth, because mercury-tin alloy is mostly used in China now. When mercury is heated to 60 degrees, it will be released when drinking soup or hot water, which will easily lead to excessive mercury content in the body and lead to decreased immunity. If pregnant women fill their teeth with silver powder, it is more likely that mercury will be transmitted to the fetus through the placenta, leading to fetal nervous system diseases. (Huang reported) Silver powder for tooth filling may lead to high mercury content in the body. A study shows that the mercury concentration in the mouth of people with silver powder fillings is six times that of people without fillings, and it will increase to 54 times if they eat and chew for 30 minutes. In another study, the mercury concentration in saliva of people who used silver powder filler was compared with the discharge standard of sewage treatment plant, and 98% of people who used silver powder filler's saliva exceeded the WHO drinking water standard. Lai Zhenyuan, director of the Traditional Medical Association of the Republic of China, said that mercury will be released when it is heated in the mouth, which will damage people's immune system. At present, dental filling materials containing mercury have been banned in the European Union, but it is still controversial in the United States. Resin is still widely used in China because of its easy shedding. When a dentist fills a person's teeth, if there are crumbs, he will clean them up and prevent the patient from eating them. However, doctors are also worried that if pregnant women use silver powder to fill their teeth, mercury may spread to the fetus through the placenta, leading to neuropathy in young children. Therefore, pregnant women had better fill their teeth with resin.