A nurse is providing oral care for a client who is immobile. Which of the following actions should the nurse take?

The correct answer is B: Turn the client on his side before starting oral care. This is important to prevent aspiration in an immobile client. By turning the client on his side, gravity helps to drain saliva and oral care solutions out of the mouth, reducing the risk of choking or aspiration. Applying petroleum jelly (A) may not be necessary and can potentially cause aspiration if the client is not turned to the side. Using the thumb and index finger to keep the client's mouth open (C) is not appropriate and may cause discomfort or injury. Using a stiff toothbrush (D) can damage the client's gums and oral tissues, especially if the client is immobile.