Wellness Oral Care interdental brush heads with DuPont bristles are ideal for cleaning braces, crowns and tight spaces between misaligned teeth. It is also very effective at removing stains and tarter. Interdental brushes serve as an alternative to flossing; they can be used daily and can be more effective for interproximal plaque removal than floss as suggested by a number of studies. Interdental brushes can be effective tools for reducing interproximal plaque. for best results use only Wellness Oral Care brush heads. Wellness recommends replacing your brush head every 3 months for optimal results. These brush heads fit the FC-P42 and FC-PX42 sonic toothbrushes. May fit other similar brands.