How can i use a water pick for oral health?

Easy: Water picks can be used easily. There are usually different attachments available. You can use any directing the tip at gum line and adjusting the jet force to tolerable. One thing that you need to know that water picks in no way can or should substitute flossing. Flossing supersedes water picks by all means and must be done at once daily. Water picks are an addition to brushing & flossing.

Yes, but...: A water pick does not replace flossing.

In between teeth: A wate pick can be used in between teeth to mechanically remove debris. This won't remove calculus, and may leave some plaque, but will remove larger food debris. Some people find it beneficial especially if they have larger spaces between teeth where food often gets stuck. Remember it is just a tool to achieve a desired goal. It's may not replace other important daily care lol floss & brushing.