Dental extractions are not recommended for patients with hypokalemia until the potassium is corrected to within the normal range. Hypokalemia may involve muscles, cardiovascular system and digestive system. Involving muscles, there may be generalized muscle weakness, even difficulty in breathing and swallowing, and in severe cases, asphyxiation; involving cardiovascular system, there may be tachycardia, atrial or ventricular pre-systole, and in severe cases, ventricular fibrillation, which may lead to sudden death from cardiac arrest; involving gastrointestinal system, there may be abdominal distension and intestinal obstruction. Hypokalemia may be life-threatening in severe cases. Extraction of teeth may cause worsening of hyperkalemia, so it is not recommended to extract teeth when the blood potassium has not been corrected to the normal range. Hyperkalemia patients should go to the hospital and correct the hyperkalemia under the doctor’s guidance, and then the doctor’s judgment will determine when the teeth can be extracted.