Gum lead lines, which appear in the gum area of lead poisoning patients. It is produced because the reaction of lead in the human body after lead poisoning causes sulfur ions, which are active with oral bacteria, to be produced at the connection point on the teeth and gums, showing a purplish-blue line. Patients can see the purple-blue lines of lead on the gums. The reaction of lead in the human body causes sulfur ions that are active with oral bacteria to be produced at the point of connection on the teeth and gums. In recent years, the danger of lead contamination to babies has become increasingly unnoticeable. So, what are the ways to prevent gum lead line? The following are the methods to prevent gum lead line: 1.The staff engaged in lead work labor must take a shower and change clothes before going home according to the regulations. 2.Children can be given foods rich in iron, calcium and zinc, such as animal liver, meat, milk, other dairy products, tofu, spinach, kale, beans, etc. 3.Families that use coal as fuel should try to open windows more often for ventilation. 4.Children should try to eat less certain foods with high lead content, such as popcorn, puffed eggs, etc. 5.Don’t eat Chinese medicine of unknown composition, and don’t use nasal spray containing Chinese medicine, because it may contain more lead. 6.Be careful when using tap water: some tap water pipes are high in lead, so when you use tap water every morning or before dispensing baby milk, you should open the tap for 1-2 minutes to let the previous section of tap water flow away and wait for the water to become cold before using it. 7. Children under six years old need to be screened for lead poisoning once a year.