I read in a few places that one has to use warm water with water flossers (e.g., Waterpik). Why wouldn't cold water be ok too?

E.g., from https://www.waterpik.com/oral-health/blog/waterpik-mouthwash/ (mirror):

all you need in your Water Flosser for clinically proven effectiveness is warm water

I have crossposted the question at:

  • 1
    What has your research shown you already?
    – JohnP
    Nov 12, 2018 at 14:27
  • 1
    I've used a Waterpik, and I know from experience that using cold water can simply be uncomfortable, especially if your tap water is fairly cold, as mine is since it's well water. I seriously doubt that temperature of the water matters in the least to the device's effectiveness. It's just a comfort factor.
    – Carey Gregory
    Nov 12, 2018 at 16:00
  • @JohnP many guides advise to use warm water but I haven't seen any that explain why Nov 12, 2018 at 16:08
  • From personal experience using a water pik with cold water can be really painful, its like icy needles poking into your gums! Use warm water so it doesn’t hurt unnecessarily.
    – Tim
    Dec 2, 2022 at 0:22

1 Answer 1


Comfort factor only.

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Aleecia :Thank you for contacting Water Pik, my name is Aleecia. How can I help you today?

Ted:Why is it recommended to use warm water in the flosser?

Ted:"all you need in your Water Flosser for clinically proven effectiveness is warm water"

Ted:Where is the study proving the clinical effectiveness?

Aleecia :I would be glad to help answer. We recommend warm water as to not cause unnecessary irritation.

Ted:How is warm water more clinically effective than other temperatures?

Ted:Or is the clinical effectiveness independent of the temperature, and warm water is only recommended for the comfort factor?

Aleecia :The only reason why we recommend using warm water is because it may cause less irritation. Purely a comfort factor.

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