The head could be bigger for a cleaner brush experience
Response from waterpik.comBy WaterPik, Product Support, April 1, 2022
Hello Doni Sue - If you're interested in a full-size brush head, click here for more information: https://www.waterpik.com/oral-health/tips-accessories/SFFB-2EW/.
The full size brushes are super - not sure why any adult would want the smaller brushes. Having said that, it seems the unit should come with either both size brushes OR only the larger size brush. However, this model comes with ONLY the small brush.