How can you get the benefits of fluoride in toothpaste when brushing your teeth if you are rinsing mouth off with water immediately after brushing.

You get some: The fluoride ions will attach themselves to the tooth during 2 minutes of brushing and are not easily rinsed away, so you do derive a benefit. If you do not rinse you may get more but be assured even with a rinse the fluoride is helpful.

Don't rinse: Don't rinse or rinse with a fluoride rinse (ACT)

Safe and healthy: The most effective way to prevent tooth decay; scientifically demonstrated. In humans fluoride is rapidly and efficiently absorbed.