A nurse is providing teaching to a client who is undergoing radiation therapy and has stomatitis. Which of the following responses by the client indicates an understanding of the teaching?

"I should use a soft-bristle toothbrush to clean my teeth after meals."

"I should limit my intake of dairy products to prevent nausea."

"I should gargle with an alcohol-based mouthwash to kill germs."

"I should moisten my lips with lemon-glycerin swabs."