There are many tools available to clean plaque between teeth in areas that may be hard to reach. These include brushes, picks, threaders, and flossers.
The dental manufacturer Denticator makes a reusable flexible plastic toothpick that can be sterilized by boiling. It comes in its own storage pouch.
Medtech Products makes a mint-flavored tapered interproximal brush with a handle extension.
Sunstar Americas manufactures an interdental brush with rubber bristles that gently removes food and plaque while massaging the gums. This product works especially well around orthodontic appliances and implants.
Other makers of interdental accessories are Procter & Gamble.