A hair stylist can do one of three things to add individual hair extension strands.
1. Use a chemical as a bonding material. This method is akin to gluing hair extensions to the ends of your own hair to extend their length. Depending on the type of bond used (wax-based bonds, for instance, need heat), fusion may entail the application of heat or not. You can buy pre-bonded hair extensions, or purchase bulk hair and glue to create your own pre-tipped hair.
2. Apply special tubing on the tips of the hair extensions. The end will be attached to yours. And then, each strand of hair extension will be carefully attached to your hair. Heat will be applied to the tubing to make them shrink, so bond the extension to your own hair.