1, smoking patients, quit smoking as early as possible before surgery, maintain oral hygiene, available mouthwash rinse. 2, before surgery, it is advisable to eat some high protein, vitamin-rich and easy to digest food, the day before surgery, 10 pm do not eat, but can drink some warm water and bright juice, do not eat anything after 2 pm. 3.The day before surgery, if possible, you can take a shower, trim your nails and shave your beard. 4.If you have all kinds of jewelry, such as earrings, necklaces, dentures, etc. should be taken off and kept. 5.The day before the surgery, if you have any insensibility, please tell the doctor, such as fever, cough, etc. 6.Ensure a good sleep at night before the operation to ensure the best condition to face the operation. If you are anxious and cannot sleep, you can take appropriate amount of sedative medication under the advice of the doctor.