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How can one choose the proper pressure setting on a water flosser (e.g., Waterpik)?

Below is what I have read and heard:

  1. https://www.reddit.com/r/AskReddit/comments/9u18am/serious_dentists_of_reddit_whats_the_biggest/e90zult/ (mirror):

    Old folks who blast their perio pockets with a water pick on the highest settings, then wonder why their pockets are getting deeper. Please use a low setting on your water pick and don't sit with it in the same spot for a minute.

  2. https://www.waterpik.com/oral-health/how-to-floss/ (mirror):

    Start with the lowest pressure setting, lean over the sink, place tip in your mouth.

  3. A dentist I visited some time ago was recommending using the highest settings.

  4. https://www.reddit.com/r/Dentistry/comments/9u6qob/how_can_one_choose_the_proper_pressure_setting_on/e9214l3/?context=3 (mirror) (note: waterpik has 10 levels, where 10 is the highest pressure):

    Our waterpik rep stated that it is most effective at a power level of 7.

  5. https://www.waterpik.com/oral-health/pdfs/WP-100-instruction-manual (mirror):

    Turn the pressure control dial on the base of the unit to the lowest setting (pressure setting No.1) for first-time use. Gradually increase pressure over time to the setting you prefer – or as instructed by your dental professional.


I have crossposted the question at:

  • The manufacturer says use the lowest setting. Why do you doubt them? – Carey Gregory Nov 4 '18 at 21:09
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    @CareyGregory They say "Start with the lowest pressure setting". They don't specify what to do after the first few seconds. – Franck Dernoncourt Nov 4 '18 at 21:21
  • @CareyGregory actually, waterpik.com/oral-health/pdfs/WP-100-instruction-manual (mirror) says "Turn the pressure control dial on the base of the unit to the lowest setting (pressure setting No.1) for first-time use. Gradually increase pressure over time to the setting you prefer – or as instructed by your dental professional." -> even the manufacturer is contradicting themselves… – Franck Dernoncourt Nov 11 '18 at 22:35
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    @FranckDernoncourt - I don't see how the manufacturer is contradicting themselves. Gradually find the setting you find most comfortable, unless a dentist says otherwise. That's not a contradiction, just a caution. I am closing this question as being answered with your own notations unless you can provide some evidence as why choosing by comfort level as written in their own instructions is erroneous. – JohnP Nov 12 '18 at 14:31
  • @JohnP waterpik first quote say "Start with the lowest pressure setting". They don't specify what to do after the first few seconds. And the second quote for waterpik only mentions what they advise for the first time use. The waterpik quotes do not answer the question at all. – Franck Dernoncourt Nov 12 '18 at 15:33

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