Does the enamel of your teeth get hurt with whitening?

It depends on what type of method you're using to whiten your teeth. I'm assuming you're using a do-it yourself type of kit. With most, there is a chance the enamel could be damaged, but I would say that is very slim (as long as you take care of your teeth). Follow all directions properly and if you're not sure you can do it yourself, visit your dentist and discuss whitening options.