One of my brackets fell off

One of my white brackets fell off randomly while I was out walking and my orthodontist said it would cost me £120 to get another one put on.

Is that the same for everyone else, that you have to pay for brackets that fall off?

I can understand from a business point of view why they would prefer to charge, but from a customer’s point of view, is it really my fault if a bracket manages to fall off??