What essential tool is commonly needed for nail art application?

Nail brushes are the essential tool commonly needed for nail art application because they allow for precision and control when painting intricate designs. They come in various shapes and sizes, each designed for specific techniques, such as creating fine lines, details, or broader strokes. These brushes enable artists to blend colors, apply nail polish evenly, and implement various art techniques like dotting or striping, which are fundamental in achieving detailed nail designs.

While nail clippers, nail files, and cuticle pushers serve important purposes in nail care and preparation, they are not directly involved in the artistic application of designs on the nails. Nail clippers are primarily used for trimming, nail files for shaping, and cuticle pushers for grooming the cuticles, none of which contribute to the actual artistic process of nail painting and design. Thus, the presence of nail brushes is paramount in fulfilling the artistic intent of nail art.