·Items used for oral care must be disinfected before being used by the patient. Observe the principles of aseptic technical operation. The movements during operation must be light and meticulous to maintain the integrity of the oral membrane and avoid unnecessary damage.·The cotton ball used must be clamped tightly to prevent the cotton ball from being left in the patient's mouth. Also be careful not to be too wet to prevent the solution from being inhaled into the respiratory tract.·When doing oral care, pay attention to the changes in the oral melt film, such as congestion, inflammation, erosion, ulcers, swelling and abnormal changes in the color of the tongue coating.