this review title is: not all toothbrush heads are same size and the content is: strange as it might sound not all toothbrush heads fit equally on my oral b electric toothbrush given that there is in the pack that should mean at least some of these will fit but i would expect a replacement toothbrush head to fit of the time.there are other information for this review, one is this reviewer did purchase it and the other is 0 people think this review is helpful.