While many women opt to take a DIY approach to their hair, fusion hair extensions should only be installed by a professional hairdresser. Without the proper training, it is easy to damage both the roots of your natural hair and your scalp. In addition, fusion hair extensions require a strong bonding agent in order to stay in place. If not applied correctly, this bonding agent can cause irritation and even permanent damage to the hair follicles. For these reasons, it is always best to leave fusion hair extensions to the professionals. Not only will they ensure that the job is done right, but they will also be able to give you advise on how to care for your new extensions.