Dental handpiece having a rolling bearing

A dental handpiece having a drive for driving a tool in a head housing, the head housing comprising,

• at least one media-carrying line arranged in the head housing and having an outlet opening toward the tool, and
• a tool receptacle arranged in a drive chamber, said tool receptacle is supported so that the tool receptacle rotates via a rolling bearing in an abutment of the head housing on a side of the drive chamber facing the tool, the rolling bearing has an outer race that is supported against the head housing radially in the abutment in a region of a raceway, the outer race has a sub-area, the outside diameter D2 of which is reduced in comparison with the outside diameter D1 in the region of the raceway,
• wherein the head housing has a first housing projection that extends into a region of the reduced outside diameter D2, and that the media-carrying line runs at least partially through the first housing projection,
• wherein the outer race is supported such that it is axially displaceable against the head housing, the outer race having a cover disk connected to it, said cover disk extending from the outer race in a direction of an inner race arranged on the tool receptacle, wherein a bias device acting in an axial direction is arranged between the cover disk and an extension of the head housing, with the bias device acting upon the outer race with an axial prestress by way of the cover disk, wherein the head housing has a second housing projection connected to the first housing projection, said second housing projection is different from the extension of the head housing upon which the bias device is arranged, the second housing projection extending radially beneath the cover disk in a direction towards a longitudinal axis of the tool, and wherein the media-carrying line runs at least partially through the second housing projection.