This is a zero star rating because you can't really give zero stars. This product is not an acceptable replacement for the WaterPik version. The tip is so flexible that it is useless for its intended purpose: cleaning and irrigating periodontal pockets. I bought two "two packs" (four tips total). Used a couple of times, found it didn't work, and threw away the whole order. Spend a little more money and buy the original that is available in other online stores.
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