Do I need to brush before or after using the Alviun Fresh Flow Water Flosser?

You can do either before or after. However, we suggest you should floss before you brush. Flossing before you brush removes more plaque than flossing after you brush, and also ensures that more fluoride remains on your teeth when you are finished. Fluoride helps prevent tooth decay by making our teeth more resistant against the acids that form because of plaque.