Traditional electric dental irrigators have a long history in the market. In terms of product structure, an AC 220V fixed speed motor is used to drive the water pump, generating a constant pulse water flow with a pulse rate fixed at around 1200 times per minute. The working heat of AC motors is relatively high. Users should pay attention to the reminders given by different models on the usage time. The single use should not exceed 2 minutes, and the usage time should not exceed 5 minutes every 2 hours to avoid machine overheating and use failure.