The endurance of the tooth washer is ok. According to official propaganda, it can last up to 30 days, with built-in 1400 mAh lithium battery, and it takes 4 hours to fully charge.

Usmile ultrasonic tooth washer is different from ordinary tooth washer. It uses ultrasonic technology to form a micro-bubble waterfall, which can thoroughly clean teeth, including the posterior tooth area that is difficult to clean normally.