The interprox plus 90 nano is a small, specialized interdental brush designed for cleaning narrow spaces between teeth. It features a unique 90-degree angle and a long handle for easy access to hard-to-reach areas, soft bristles for gentle cleaning, and bi-color bristles to indicate plaque and bleeding. It is recommended for adult oral hygiene, comes with a hygienic cap, and is used before or after brushing to remove plaque and food particles, helping to prevent gum disease.