I have a mouth guard and use tablets and I appreciate you bringing this up because one of my conundrums as a person with Bronchiectasis is the use of a Waterpik. I absolutely need to use one b/c of dramatic bone recession I have had since a very young woman and without using it on a daily basis I would have no teeth! Luckily, because of my excellent dental hygiene I have done well, but now I am stumped as to what to do given the worsening of my lung condition as I only clean the Waterpik with Vinegar solution or hydrogen peroxide. Any thoughts on this would be much appreciated.