A clinician must advise a patient who uses a high-fluoride prescription mouth rinse daily. Which rationale best uses the absorption routes to minimize systemic fluoride exposure while preserving oral benefits?

• A. Suggest diluting the mouth rinse with water to reduce viscosity, because thinner fluoride solutions are preferentially taken up by gingiva and produce less systemic absorption.
• B. Recommend a supervised spit-and-rinse technique after a set contact time and avoid swallowing to maximize local uptake by teeth and gums and minimize intestinal absorption.
• C. Tell the patient to always eat immediately after rinsing to bind fluoride in food and thereby neutralize its effects so it cannot be absorbed at all.
• D. Advise the patient to swallow the rinse slowly to allow intestinal absorption which is more efficient and will then redistribute fluoride back to teeth via circulation.

Answer: (B)