Which action can minimize fluoride ingestion and enhance its absorption during topical application?

The correct choice highlights the importance of using only the minimum amount of fluoride necessary for effective treatment. This approach minimizes the risk of excessive fluoride ingestion while ensuring sufficient fluoride is applied for optimal absorption and effectiveness. By limiting the quantity used, you reduce the chance of the fluoride being swallowed, which can occur if an excessive amount is applied. This helps achieve the desired therapeutic benefits without increasing the risk of fluoride toxicity.

Using excessive fluoride, as suggested in another option, could lead to overexposure, which might not only be less effective but can also pose health risks. Allowing the patient to swallow after the procedure would also defeat the purpose of the topical application, as swallowing fluoride limits its local benefits on the teeth. Similarly, avoiding saliva ejectors does not specifically enhance fluoride absorption and might lead to the accumulation of saliva, which can dilute the fluoride during the application process.