Which action is effective in maintaining oral health during dietary discussions with patients?

Maintaining oral health during dietary discussions with patients is best supported by reinforcing good oral hygiene practices. This action directly impacts a patient's ability to maintain oral health by encouraging them to adopt effective brushing and flossing techniques, which help to remove plaque and bacteria that can lead to dental issues like cavities and gum disease. Reinforcement ensures that patients are aware of the importance of maintaining a clean mouth and how dietary choices can affect their oral hygiene.

In contrast, while changing a patient's toothpaste might have benefits, it doesn't directly address the overall oral hygiene practices that are crucial for health. Promoting regular dental visits is also beneficial, but it is more focused on preventive care rather than the day-to-day practices that the patient has control over. Extracting non-healthy teeth, while sometimes necessary, is a more invasive approach and does not contribute to maintaining oral health through dietary discussions. Therefore, the most effective action in the context of dietary discussions is to reinforce oral hygiene practices.