Are extensions bad for your hair? Short answer: They can be – but only if they’re done incorrectly. If your stylist uses too much hair (which adds too much weight), puts too much tension on your scalp, or doesn’t install them properly, then yes, it can lead to damage. But when applied professionally, with the right technique and care, extensions won’t harm your hair. In fact, they can even help protect your natural hair and support healthy growth by giving your strands a break from daily styling