What is the difference between c1 and c2 sonicare brush heads

You want to opt for the Sonicare C1 Pro Results or C2 Optimal Plaque Control brush head is my choice for superior every day, all-round cleaning. The C2 Optimal Plaque Control is better suited to those brush handles that have BrushSync technology (more on that below).

(formerly ProResults plaque control)

The only difference is that the bristles are clear. The bristles are fall between medium and soft While Philips sonicare claims that the bristles are “extra soft” on the packaging, the shape of the center bristles gives a firmer feeling than the sensitive toothbrush head.