Glow Beauty The Smoothing Brush in Glow Beauty Blue. Glow Beauty The Smoothing Brush in Glow Beauty Blue. Elevate your hair care routine with Glow Beauty's handcrafted Smoothing Brush. With a mix of 100% natural boar bristle and clear nylon bristles, this brush helps move oils throughout your hair to increase smoothness and shine. This is the ultimate tool to achieve sleek, shiny, and healthy hair. Every brush comes with a complimentary dust bag. Because the boar bristles are a natural product there may be some variation between hairbrushes.. Boar bristles are rich in keratin so they distribute your hair?s natural oils from root to tip, leaving your hair hydrated, smooth, and naturally glossy. Nylon bristles reach the scalp to gently exfoliate, promoting circulation and supporting a healthy scalp environment. Designed for fine to medium-thick hair, straight to wavy textures. Crafted with high-quality materials that hold up over time. GUTR-WU9. BRB-001.