One of the dangers of extra pressure to your scalp can be a thinning of your natural hair.
This is not an easy answer since hair extensions can be created from 100% real human hair, 100% synthetic hair or a mixture of human, synthetic and animal hair.
Hair extensions are available in just about any color, texture or length.
Many movie stars ranging from Madonna and Demi Moore to Cameron Diaz have used hair extensions for movie roles.
It's a great way to create an instant long haired look.
This means that you will almost always be required to have the ends of your hair cut after the extensions are removed.