The registered nurse is teaching a nursing student about care for a patient who is on oral warfarin therapy. Which statement made by the nursing student indicates the need for further teaching?
1. "I will suggest that the patient use aspirin for pain."
2. "I will warn the patient to shave only with an electric razor."
3. "I will teach the patient techniques to control external hemorrhage."
4. "I will teach the patient to inform his or her dentist about the medication therapy."