Amazon.com Review
For optimum cleaning performance, electric toothbrush heads should be replaced every six months. This standard-size replacement brush head fits all original Sonicare and Advance series handles. Color-coded for individual users, the brush head features eight rows of extra-soft, rounded bristles for gentle yet thorough cleaning. The standard size was formerly known as compact.
--Ann Bieri
Product Description
For use with Advance series handles only. Works with all original Sonicare and Advance series handles. Advance Series: Standard Size - Optimum tooth coverage for efficient cleaning; Not compatible with Elite series handles.Colors may vary.