Good fit but bristles are hard

The risk w/ aftermarket parts is a bad fit but these fit perfectly in my 8-year-old Sonicare. However, the bristles seems extremely hard and have been causing pain especially with the notable vibration of the appliance itself. I worry that these are too harsh and definitely harsher than the way too pricey Philips brand replacements. But who can afford those? The price difference is so huge that I'm willing to risk the quality difference and work with it. Probably this old appliance will die before I use these brushes up anyway and I will replace it with something more up-to-date. Meanwhile I'm glad I can still get replacement heads.

###

