Interdental cleaning tool

An interdental cleaning tool comprising:

• a base material portion including a base section and a shaft section extending from the base section, the shaft section including a transition section and a distal end section extending from the transition section, wherein the transition section is flat, wherein the distal end section includes a distal end region and a proximal end region, and wherein a cross-sectional of the distal end section gradually transitions from a circle at the distal end region to a rectangular shape at the proximal end region;
• and
• a soft portion covering the distal end region and the proximal end region of the shaft section, and having projections in at least a part of the distal end region wherein,
• the distal end section of the shaft section is configured with different cross-sectional shapes and cross-sections perpendicular to an axial direction of the shaft section,
• the distal end region is configured with a true-circle cross-section perpendicular to an axial direction of the shaft section, and
• at least a part of the proximal end region of the shaft section has a first outer cross-sectional dimension defined in a first direction and a second outer cross-sectional dimension defined in a second direction perpendicular to the first direction, where the second outer cross-sectional dimension is smaller than the first outer cross-sectional dimension with the first and second outer cross-sectional dimensions each being perpendicular to the axial direction of the shaft section.