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's 10 in the pack, that should mean at least some of these will fit.  But I would expect a replacement toothbrush head to fit 100% 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.