Good until mold and bacteria grow
Because this is used around water all the time, mold and bacteria grow, that is natural. What I'm really upset about is when I tried to dissemble the handle and main unit for cleaning, I find that the handle is glued together, making it impossible to take apart without destroying it. In older videos online, the handle was seen to be held together by clips and could be taken apart non-destructively. What's WORSE is that the main unit has long, tapered holes to prevent unscrewing with a normal screwdriver. It fits part of the way down, then is blocked.  WATERPIK DESIGNED THIS AS A NON-MAINTAINABLE THROW-AWAY. You lost my future business, Waterpik.  SAD SAD SAD
Rating: 1 stars