A dental hygiene device such as an interdental brush includes a handle, a brush head having bristles extending therefrom, and a neck portion extending between the brush head and the handle. At least some of the bristles may have a substantially triangular cross section. The neck portion defines a longitudinal axis and has a first bending stiffness when subject to loading in a first direction that is substantially perpendicular to the axis, and a second bending stiffness when subjected to loading in a second direction that is substantially perpendicular to the axis. The first bending stiffness is less than the second bending stiffness such that the dental hygiene device can be reoriented during use to provide a more gentle or a more robust cleaning to interdental spaces.