The nurse should use an alternative oral hygiene technique, such as using a soft toothbrush, foam swabs, or mouthwash, to assist the client with a disorder of the oral cavity who cannot tolerate tooth brushing or flossing. Additionally, the nurse can provide education to the client and family members on how to maintain good oral hygiene and prevent further complications. It is important to assess the client's preferences and limitations and collaborate with the healthcare team to develop an individualized plan of care.