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Combined brushing power with the same amount of time - 2 in 1 brush head, which removes more surface plaque than a regular brush.
There are 4pcs of brush heads as one package. The brushes should be replaced approx. every 3 months or when the indicator color of the brushes when halfway down and they fit ALL Oral-B electric toothbrushes except Pulsonic or Sonic toothbrush.