Cheng, Y.H. et al. The effect of antioxidant Chinese herbs on SOD activity, MDA content and ultra-structural damage of the kidney tissue in mice with chronic fluorosis. Guizhou Medical Journal. China. 1998.

Dr. Cheng found a similar result to Dr. Dai sited above when he studied the the kidney cells of mice with chronic fluorosis. the mice had reduced presence of free radicals and increased presence of internally produced anti-oxidants.