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Oral-B® Sonic SR18 Replacement Head is a replacement head for the Braun Oral-B® Sonic Brush. These refills have interlocking filaments with multiple angles and opposite directions to access the teeth and reduce plaque build-up.
The bristles on the feeding tip are longer, so they can reach more difficult places. In addition, they have indicator bristles that fade midway to indicate when the brush head needs to be replaced.