[Dental fluorosis of brick tea type in rats]

To observe the dental fluorosis of brick tea type, 48 white rats were fed by 245 mg.L-1 of brick tea, respectively. The rat model of brick tea type fluorosis were successfully established after 90 days. Naked eye examination of rats' incisors showed that brick tea and sodium fluoride (as positive control) groups all suffered from dental fluorosis. Using the dissecting microscope, the scanning electron microscope, and the energy spectrum apparatus, we also proved that the high concentration of brick tea could cause dental fluorosis.