The Waterpik Sonic Fusion 20 wins for comprehensive oral care by combining sonic brushing with water flossing in one unit, outperforming the Philips Sonicare 4100 on features by a wide margin. The Sonicare 4100 leads in battery life and portability but lacks any flossing capability. Real-world comparisons from dental sites show the Fusion reduces gingivitis scores more effectively when users sk...