The single star is because only one brush head was included with my unit. It was supposed to include 2.
I would recommend this to a friend!
Response from waterpik.comBy WaterPik, Product Support, January 28, 2022
Hello Lilypad - Depending on which Sonic-Fusion unit you purchased, the brush heads vary. Additional brush heads may be purchased. Here is a link to tips and accessories for the model:https://www.waterpik.com/oral-health/tips-accessories/flossing-toothbrush/SF-03W010-1/. If you have any questions, please reach out to us at 1-800-525-2774 or email smreviews@waterpik.com.
Puny Head leaves plaque on ky teeth. It us also hard to maneuver. Doesn't seem to be conducive for clean teeth and gums. For the cost of this product it should come with both heads.