When you use a Waterpik water dental flosser it's recommended to use the WaterPik at least once per day everyday to keep your teeth clean and healthy.
You can then use string floss to floss your teeth after that and follow through with regular tooth brushing as well to keep your teeth healthy and clean.
A Waterpik water flosser is a good thing to keep your teeth clean and healthy and prevent tooth decay, gum disease etc.
However you still should use string floss at least every other time you use water floss or every other day to remove any leftover particles in your teeth.
You should also brush your teeth 3 times per day after every meal to keep your teeth clean.
If you don't take care of your teeth properly then you'll lose them and won't be able to eat some of the foods you love.