To use a boar bristle brush, start at the roots and brush in small sections, moving down the hair length to distribute natural oils evenly. For best results, use on dry hair and brush gently to avoid breakage. To maintain the brush, remove hair buildup after each use and wash it monthly by soaking the bristles in warm water with mild shampoo, avoiding the bamboo handle to prevent damage. Allow the brush to air dry with the bristles facing down. Proper care extends its lifespan and keeps it performing optimally.