Interdental cleaner

1. An interdental cleaner for cleaning interdental spaces and defining a longitudinal axis, the interdental cleaner comprising:

a cleaning portion for interdental cleaning;

a flexible neck portion connected to the cleaning portion; and

a handle portion connected to the cleaning portion by the flexible neck portion, the longitudinal axis extending from the handle portion to the cleaning portion,

wherein the flexible neck portion is made of a first plastic material having a first ribbed surface and a second planar, non-ribbed surface opposite the first ribbed surface, and a second plastic material that is softer than the first plastic material and includes a second ribbed surface that covers the first ribbed surface and the second planar non-ribbed surface, the first ribbed surface having a plurality of ribs that each extend parallel to a transverse axis that is perpendicular to the longitudinal axis, the second ribbed surface defining one or more ribs that extend outwardly about a perimeter of the flexible neck portion that is transverse to the longitudinal axis; and

wherein the cleaning portion and the handle portion are made of the first plastic material to form a unitary, one-piece, integral construction with the flexible neck portion, and

wherein the flexible neck portion is configured to allow the cleaning portion to bend relative to the handle portion about the transverse axis.

2. An interdental cleaner for cleaning interdental spaces comprising:

a base member comprising an integral construction formed entirely from a first plastic material and having a longitudinal axis, the base member including

a base handle,

a stem, and

a joint that connects a front end of the base handle and a rear end of the stem and is flexible relative to the front end of the base handle and the rear end of the stem, the longitudinal axis extending from the base handle to the stem, the joint defining a first interior ribbed surface having a plurality of ribs that each extend parallel to a transverse axis that is perpendicular to the longitudinal axis and a second interior planar non-ribbed surface opposite the first interior ribbed surface, wherein the joint is configured to allow the stem to bend relative to the base handle about the transverse axis; and

an outer layer made of a second plastic material softer than the first plastic material, the outer layer surrounding the joint on all sides thereof and forming an interior non-ribbed surface and an exterior ribbed surface.

3. The interdental cleaner of claim 2 , wherein the base handle has a flat slender plate shape.

4. The interdental cleaner of claim 2 , wherein a top surface and a bottom surface of the base handle are at least partially covered by the outer layer.

5. The interdental cleaner of claim 2 , wherein the joint has a generally rectangular cross section that is thinner than a cross section of the front end of the base handle and a cross section of the rear end of the stem.

6. The interdental cleaner of claim 2 , wherein the outer layer extends along a length of the joint.

7. The interdental cleaner of claim 6 , wherein the outer layer tapers along the length of the joint in a direction toward the rear end of the stem.

8. The interdental cleaner of claim 6 , wherein the exterior ribbed surface comprises a series of second ribs that extend outwardly from and along the length of the joint.

9. The interdental cleaner of claim 8 , wherein each of the second ribs surrounds the joint on all sides thereof.

10. The interdental cleaner of claim 2 ,

wherein the stem includes a stem body connected to a bristle core,

wherein the stem body has a generally flat, V-shaped configuration that tapers in a longitudinal direction away from the rear end of the stem, the stem body defining a channel along a length of the stem body, and

wherein the outer layer is received in the channel of the stem body and covers an outer surface of the bristle core, the outer layer forming a plurality of bristles along a length of the bristle core.

11. The interdental cleaner of claim 2 , wherein the outer layer also covers at least a portion of the base handle and at least a portion of the stem and the outer layer is continuous between the joint and the base handle and between the joint and the stem.

12. The interdental cleaner of claim 2 , wherein fibers are present in the base member at a concentration of about 12 wt % to about 35 wt %, the fibers comprise glass fibers, carbon fibers, or aramid fibers.

13. An interdental cleaner for cleaning interdental spaces and defining a longitudinal axis, the interdental cleaner comprising:

a cleaning portion for interdental cleaning;

a flexible neck portion connected to the cleaning portion;

a handle portion connected to the cleaning portion by the flexible neck portion; the longitudinal axis extending from the handle portion to the cleaning portion and

wherein the flexible neck portion is made of a first plastic material having a first ribbed surface and a second planar, non-ribbed surface opposite the first ribbed surface, and a second plastic material that is softer than the first plastic material and includes a second ribbed surface that covers the first ribbed surface and the second planar non-ribbed surface, the first ribbed surface having a plurality of ribs that each extend parallel to a transverse axis that is perpendicular to the longitudinal axis, the plurality of ribs being spaced apart in a direction of the longitudinal axis, the second ribbed surface defining one or more ribs that extend outwardly about a perimeter of the flexible neck portion that is transverse to the longitudinal axis; and

wherein the flexible neck portion tapers along the longitudinal axis of the interdental cleaner, and

wherein the cleaning portion and the handle portion are made of the first plastic material to form a unitary, one-piece, integral construction with the flexible neck portion.