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 connection points on the teeth and gums. Lead poisoning is a serious disease caused mainly by the cumulative absorption of lead, often occurring in children between the ages of 6 months and 6 years, and can affect children’s behavior, cognition, speech, and severely affect children’s health and learning, even leading to convulsions, coma, and death. So, how to diagnose whether lead poisoning causes gingival lead line? The following is the diagnosis method of lead poisoning leading to gingival lead line: 1.Nervous system Affects visual motor function, language ability, sensory and behavioral function, etc., with symptoms such as backward intellectual development, slow reaction, insomnia, headache, irritability, hyperactivity, etc. 2.Digestive system Causes diarrhea, constipation, abdominal pain, indigestion, liver lesions, etc. 3.Cardiovascular system Lead poisoning can lead to myocardial degeneration, hypertension, arrhythmia, aortic and coronary artery degeneration. 4.Hematopoietic system Lead can inhibit the synthesis of hemoglobin and lead to iron deficiency anemia.