INTERDENTAL PRO replaceable toothbrush heads, designed for cleaning interdental spaces and hard-to-reach areas Refill kit for interdental toothbrush. Thanks to the different levels, it gently cleans teeth and hard-to-reach areas to help prevent cavities. The product has a small head and a long, thin neck, designed for hard-to-reach spaces. The brush head includes a soft tongue cleaner for fresh breath and a wear indicator to maximize the products benefits. The blue color of the bristles fades when its time to replace it with a new brush head. Keep the handle and insert the brush head until you hear a click. Use it until the color fades, then replace the brush head again. With non-slip grip to help improve your oral hygiene, with ultra-precise cleaning. Its recommended that you change the brush head every 3 months or when the bristles begin to fade. Keep the handle and use the Fluocaril Interdental PRO Replacement Brush Head Refill Kit.