Fever after tooth extraction in children may be related to absorptive fever, other sources of infection and bacteremia. 1. Absorption fever: If the child has multiple teeth, due to the relatively complex and traumatic surgery of extracting multiple teeth. Transient absorptive fever may occur after the surgery, and the body temperature usually does not exceed 38.5 degrees, and can recover by itself. 2. Other sources of infection: If it is just a simple tooth extraction, there is usually no fever. It may be caused by infection in other parts of the body, such as upper respiratory tract infection. 3. Bacteremia: When the wound is large after tooth extraction, when pathogens such as Staphylococcus haemolyticus or Pseudomonas aeruginosa enter the bloodstream. Patients may experience symptoms such as fever and headache. Fever after tooth extraction in children can also be seen in other causes, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions for relevant examinations, with the help of the doctor to clarify the cause, and targeted treatment or therapy.