Here, we develop a comfortable dental headpiece with aerosol reduction function as shown in Figure 3. This can not only help reduce the air pollution, but also reduce noisevibration, enabling future dental treatment to be safermore pleasant. Air curtain are traditionally used to contain pollutants in large area, here we used the air curtain technology to contain air pollutants in a small area at the sourceadded negative ions to remove air pollutants within. This technology can also be applied to other handheld tool that emits air pollution.

The water two-phase change is used for energy conversion,the average air flow rate of the invention can be completely isolated as long as 0.2 m/sec, which can save 6RT freezing capacity equivalent to 6KW energy consumption compared with the conventional smoke exhausting cabinet body, effectively interacting with the outside world. Space isolation to avoid leakage of high pollution toxic gases