firmer than other heads [SEP] compared to my regular replacement heads these heads feel much firmer and more stimulating to the gum they also snap more firmly to my brush than do my regular heads and run more quietlyif i had to choose between the two i would choose my regular head first because however i have already bought these and they may have some beneficial effects the regular heads lack i have chosen to alternate the heads i use one head to clean my teeth with baking soda then floss then use the other head to brush with toothpastei have now been using this head for two months it only took a couple of days to get used to the stiffness and i would not even notice it if i was not alternating the heads i see no evidence however that it cleans any better