Dental handpiece having a no-return device.

[Objects of the Invention] When the liquid in the mouth of the patient who was kept from supplying in the mouth air and water which were polluted, and was attracted by the pullback control valve during medical treatment is flowed backwards, it is made not to go into people directly in a dental handpiece. [Elements of the Invention] an air supply way for turbines which supplies compressed air to a turbine shuttlecock, a water absorption road which supplies rinse water into the mouth, and a cutting layer blow away -- business -- a dental handpiece device which installs a filter or more [of an air supply way for chip air which supplies air] in any one, and filtered the above-mentioned compressed air etc.