Abstract: A brush for a sonic toothbrush with longitudinal axis vibration having an elongated base body has a frustoconical base portion with a drive adapter for rotation-fixed coupling to a sonic toothbrush drive with longitudinal axis vibration, and a head portion with a bristle support in which a plurality of bristles are anchored, and an elongated neck portion connecting the base portion and the head portion is disclosed. The base body forms a kink angle in that a geometric base portion longitudinal axis and a geometric head portion alignment axis include an angle ? in the range of 5° to 12°. A geometric kink position in the base body has a distance from an end face of the base portion of at least 50% of a total length of the base body.

Abstract: The present invention relates to an interdental brush (1, 1?) having a brush part (2) comprising two twisted-together legs (4A, 4B) of a wire section (4) and brush filaments (5) held clamped between the legs (4A, 4B), and to a method for producing such an interdental brush (1, 1?). In order to improve in particular the bending fatigue strength of the wire section (4), it is provided according to the invention that a wire section (4) made of an austenitic steel is used which has a chromium content of 15 to 17 wt. %, a manganese content of 12 to 16 wt. % and a molybdenum content of 0 to 4 wt. %, and that the wire section (4) is formed with an oval cross-section having an ovality O in a range between 0.4 to 0.9, wherein the ovality O is dimensioned as a ratio between a length (LQk) of a small transverse axis (Qk) to a length (LQg) of a large transverse axis (Qg) of the cross-section.