Loose teeth: Kidneys control the bones, and bones rely on the nourishment of the Kidney Essence. The teeth are considered an ‘extension of the Bones’, so the state of bones have a direct impact on the teeth. Kidney Deficiency could lead to malnourishment of the bones, which in turn leads to loose teeth. Both Kidney Yin Deficiency and Kidney Qi Deficiency could cause loose teeth.
Hair loss or premature graying: from TCM theory, the kidneys manifest in the hair, and hair is the surplus of blood. Since the kidneys play a role in transforming stored essence into blood, they are thought to be the origin of hair. Kidney Qi Deficiency or excessive worry would affect the quality and quantity of hair. Under normal circumstances, graying start after the age of 40, this is due to the nature but gradual decay of Kidney Essence. The malnourished hair begins to turn gray, and as a natural phenomenon, no treatment is needed. But if the hair loss and graying occurred suddenly, it is mostly likely caused by the disruption of the body's functional activities of Qi, and treatment is recommended.