Noise can cause unwanted masking of sounds, interference with speech, even pain and injury, and temporary or permanent loss of hearing. Concerning exposure of noise levels at the workplace, industrial plants and huge machines are usually considered. However, there are ‘‘clean’’ jobs where people are exposed to significant noise. One example, which will be treated in this paper, is dental practice. In this work it is intended to show the results of SPL measurements that were done at the Dept. of Pedodontics in the School of Dental Medicine Zagreb. One- and two-channel measurements were made using a sound level meter and an artificial head (head-and-torso simulator). Noise levels generated by various dental devices, their spectra, and differences between noise levels in left and right ear (in the dentist’s usual working position) were shown. The sound power and subjective sound levels regarding sound source frequency and intensity were determined upon results of these measurements. Special attention was paid to ultrasound and infrasound components, as well as vibrations. Since two Faculty practices with a dozen of dental sets in each were at our disposal, influence of aging and wearing, particularly in mechanical devices, was also considered.