Helped teeth pain very quickly

I have sensitive teeth. I sent my husband shopping for toothpaste when I had run out and he got a popular brand for sensitive teeth that included whitening. I usually don’t use whitening products, but I gave it a go.
After a few days my teeth just hurt! All the time. So I shopped around for something else that helps enamel and sensitivity. I read about biomin f in a random internet thread and then decided to order. Well, I’ve only had this toothpaste two days, but my sensitivity is basically gone. I’m going to keep using and reorder when the time comes! Jessica