Gua sha can improve your hair health. There are several key factors that affect your hair health. These include a Kidney Qi (energy) Deficiency which can be balanced by doing a simple gua sha technique.
The area where gua sha is being done in the video, hairline, is directly connected with your Kidneys, the organ responsible for your hair's health. Using a gua sha or another acupressure tool to stimulate it, will help to support the organ's energy resulting in stronger and healthier hair. If you do not have a gua sha tool, use your fingers with firm pressure.