Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not Good

I have used a counter standing Waterpik for a number of years and thought this would be a great thing having a smaller, more portable version. What a waste of money. If you do the recommended 5 secs per tooth, you can only do about 3 teeth before you have to shut it off and open it up and refill it again. Can't get the tip to stop twirling either. Yuk. Back to the countertop version...