The following excerpt adapted from Living Reality by Bhai Sahiba Dr. Bibiji Inderjit Kaur Khalsa, Page 74-75
We put a wooden comb (kangha) in the hair so the electric magnetic field is stabilized and does not change. Guru Gobind Singh was the most scientific scientist. He gave us the wooden comb so that we could balance our own electromagnetic energy for the brain by combing our hair with wood. For normal health, for increased energy, for the eyes, for women’s menstruation cycle, and long maintenance of our youth, we use a wooden comb, combing the hair up, back, forward, and so on. Strong circulation and stimulation of the scalp with a wooden comb enhances health, energy and longevity.