I've been using Sensodyne for years since I first got receding gums after having babies. I have often used the gentle whitening, but like to use repair and protect when my gums are sensitive, sore or bleeding.
My dentist told me not to brush my teeth with it, but to rub on to them with my finger so that it coats my teeth and gums. That works much better.
It claims to repair and protect vulnerable sensitive areas of the teeth, and it certainly does that.
I used to think sensodyne was expensive, but since developing a taste for quality whitening toothpastes, I realise that at around $8, it is very good value for a product that reduces pain and keeps teeth white.
I will continue to use it, and recommend it to others to try.