interdental

adj

1. Pertaining to the space between the teeth.

   “It is recommended to use an interdental brush, or dental floss, to clean between the teeth.”

2. Pronounced with the tongue between the top and bottom teeth.

noun

1. A speech sound pronounced with the tongue between the top and bottom teeth.
2. A small toothbrush for cleaning in between adjacent teeth.

   “After he was struck by lightning, Melnyk suffered chronic problems with his teeth, despite brushing and flossing and using interdentals and even a Water Pic.”