Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Works Great!

I have an extreme case of Periodontics and my dentist recommended the water flosser to help with my daily routines. I love how my teeth and gum feels after using it, I sometimes use my medication in the water and be sure it will be delivered to every part of my gums.the only reason I gave it 4 star, is because it is a bit messy. if you are not careful the water will spray all over. I wish I got the portable one so I can use in the shower.