Hair extensions are commonly attached to naturally growing hair with glue, which can cause chemical irritation and damage to the hair and scalp. A Japanese technique that is called "pinch braiding" attaches the hair extensions by braiding it into the natural hair and securing it by wrapping elastic thread around the hair.
Hair extensions are treated and processed before they can be added to lengthen hair. The extensions may require chemical straightening to match the texture and smoothness of naturally growing hair. A Japanese straightening technique that is also referred to as "thermal reconditioning" or a "Japanese straight perm" is a process that uses a protein conditioner and a cream-based chemical relaxer to soften and straighten the hair. It can be applied to the hair extensions alone before they are added to the hair, or can be applied to both the natural hair and the extensions.
The Japanese braiding technique is more natural than using chemical hair glues and more comfortable than sewing or weaving the hair extensions into the hair. Unlike extensions that are attached with glue, braided extensions can be easily removed by cutting the elastic thread and unbraiding the hair.
For some individuals, getting hair extensions using the Japanese braiding technique can cause sensations of tightness and pulling at the scalp. The numerous small braids can also add bulk to the back of the head, making it difficult for some people to sleep while lying on their back. The braids can extend hair washing and drying time and cause scalp build-up and itchiness. Additionally, you cannot wear your hair up with this technique as the braids and elastic thread will be visible.