Biology has very few laws, but one law is the Arndt- Schultz Law. It states that small stimuli are stimulating.Large stimuli tends to inhibit. For example, a little electrical current stimulates circulation and healing. A large electrical stimulations caused decreased circulation and cell death. Mild irritating reconstructive solutions cause dilation of blood , vessels and a migration of fibroblasts (healing cells) to the injured areas. The fibroblasts then lay down collagen which is structural protein to repair the areas. The University of Iowa and Dr. Hackett's research substantiate this regrowth.