Rinsing after brushing teeth should be done with a fluoridated, antibacterial rinse. If you use water, which many people do, it will remove remnants of those toothpaste suds coating your teeth, and these suds contain fluoride. Therefore, you are losing an opportunity to nourish and protect your teeth by using water. NOTE: It’s certainly expected to spit out excess suds, because you are not supposed to swallow them! What we’re talking about is the remaining residue on your teeth.
So let your teeth bask in the afterglow of brushing and allow that light coat of post-brushing suds to absorb into your teeth. For additional benefits, don’t consume any beverages or food at least 30 minutes after brushing.