Regarding the fluoride application technique, what should be advised to patients?

Patients should be advised to expectorate after the fluoride application to ensure that they do not swallow any excess fluoride. This is important for both the efficiency of the treatment and the patient's safety. Spitting out the fluoride allows for the optimal amount to remain on the teeth, maximizing its benefits in strengthening enamel and providing protection against decay. Additionally, swallowing fluoride can lead to unwanted systemic absorption and potential toxicity, especially in higher concentrations.

Remaining silent throughout the application might help in avoiding disturbances during treatment, but it is not a key recommendation. Drinking water immediately post-application can dilute the fluoride and reduce its effectiveness, so it is not advised. Eating food right after treatment may interfere with the fluoride's ability to adhere to and protect the teeth, as it can wash away the fluoride that is supposed to linger and work beneficially. Thus, advising patients to expectorate effectively emphasizes the importance of fluoride retention and overall oral health.