Review title is They Work, But Don't All Fit The Handle Well [SEP] These brushes look and brush the teeth just like the original ones. However, they vary considerably in the way they fit the handle. Some fit pretty well, others are quite loose or quite tight. Those that are too loose result in a annoying buzz while cleaning the teeth. The ones that are too tight are difficult to install and remove. This may be the reason the price is so reasonable, quality control was not what it should have been.<br /><br />In spite of this, they all will install on the handle and they do clean the teeth. I will put up with the frustration of an incorrect fit for the low price!