After resection of buccal cancer, mouth opening can usually be restored after wound healing, and patients need to have appropriate rehabilitation training and regular review after surgery. Buccal cancer belongs to a type of oral cancer. In the short term after surgical resection of buccal cancer, if the wound is not completely healed, patients may have difficulty in opening their mouths, and generally the patients’ opening of their mouths can be restored to normal after the wound is healed. After surgery for buccal cancer, patients need to carry out speech, chewing and other functional exercises under doctor’s guidance, which is conducive to restoring the function of mouth opening. Patients should eat protein and vitamin-rich food after buccal cancer resection, such as eggs, milk, apples, oranges, green vegetables, lettuce, etc., which can promote wound healing. Difficulty in opening mouth may be recovered after surgical resection of buccal cancer, it is suggested that patients should consult doctor for checkup in time after surgery, and doctor will choose appropriate measures for treatment according to the recovery of patient’s body.