Airflow polishing powder, lemon flavor. Polishing makes your teeth smooth and easily removes stains. Unopened. Recommended use-by date: October 31, 2024. (I am also selling the same set. Please take a look.) I am selling this because the Airflow machine broke and I no longer use it. When you shake the bottle, you can hear a rustling sound. Discounts are available for multiple purchases, so please feel free to inquire. No claims, no returns.