There are different ways to attach a hairextension. Some of these methods include ring hair extensions, which are one of the oldest methods of hairextension. Sewed hair extensions, which are attached to the skin using a needle and thread. Keratin hair extensions, which are attached to the hair using Keratin, glue. There are also Laser hair extensions where the hair is attached using laser rays. Lastly, hairextension using small braids and knots between the natural hair layers.