[High Quality-Superior Clean] Slim angled neck and densely packed bristles of replacement heads help deep clean and remove up to 8x plaque compared to a manual toothbrush. Replacement brushes for are standard size for adultsThis toothbrush head compatible with Oral-B Pulsonic with specially contoured soft bristles adapt to the shape of your teeth and remove stubborn plaque, avoid damaging sensitive gums and bring a comfortable brushing experience[Indicator Bristles] Replacement toothbrush heads become less effective after three months of use. Suggest replacement within three monthsThese toothbrush heads for Oral-B Pulsonic are individually sealed and equipped with a clear hygienic cover that makes storage and travel easier and protects them from dust