Question 1

Which is better, Waterpik Aquarius WP-660 or Waterpik Sonic-Fusion 2.0?

Accepted Answer

Based on our testing, the Waterpik Aquarius WP-660 scores higher overall at 9.2/10. The Waterpik Aquarius WP-660 scored 9.2/10 and the Waterpik Sonic-Fusion 2.0 scored 8.6/10 in our Best Water Flosser Irrigators 2026 evaluation.

Question 2

Is the Waterpik Aquarius WP-660 worth it over the Waterpik Sonic-Fusion 2.0?

Accepted Answer

The Waterpik Aquarius WP-660 scores 9.2/10 while the Waterpik Sonic-Fusion 2.0 scores 8.6/10. The Waterpik Aquarius WP-660 is our "Best Overall" pick in the Best Water Flosser Irrigators 2026 category.

Waterpik Aquarius WP-660 vs Waterpik Sonic-Fusion 2.0: Which to Buy?