1. In the safe working frequency, it is not easy to break the file needle (safe working frequency:1500~3000Hz). 2. The file needle has a 1.5~2.5mm safe end, which is not easy to form steps or sideways. 3. The Air Sonic Endo Handpiece has a safety swing of about lmm during operation. 4. Using the Air Sonic Endo Handpiece to prepare the root canal is different from traditional reciprocating rotating instruments and Contra Angle handpiece. It only requires one file to prepare the entire root canal, reducing the trouble of frequent needle replacement and improving work efficiency. 5. Efficient cutting efficiency, Canal shaping, and irrigants. 6. Both powerful root canal cutting and cleaning functions. 7. Combined with Qmix, MTAD,EDTA,it can effectively remove root canal smear layer, dentin debris and residual mixture. 8. Facilitates easier canal preparation and instrumentation. 9. Cavitates irrigants for complete canal disinfection. 10. The only endo handpiece that can clean an isthmus. 11. Effectively removes debris in buccal and lingual extensions left unprepared by NiTi instrumentation. 12. Used in conjunction with sodium hypochlorite to continuously sonic the root canal flushing ability, improve the quality of root canal treatment, reduce the incidence of postoperative discomfort, and enhance the healing effect. 13. Effectively expand the root canal, easy to maintain the original shape of the root canal, very suitable for oval or C-shaped root canals. 14. There is no rotation movement, it is very suitable for bending the root canal, and it is recommended to pre-bend the file. 15. Very little incidence of broken needles and special techniques can be used to remove broken File needles.