Photomicrographs of rabbit oral mucosa for histopathological examination. A1&2: Control and treatment group respectively at one-day interval reveals heavy infiltration of inflammatory cells. B1&2: Control and treatment group respectively at three-day interval reveals slightly decrease of inflammation in treatment group compared to control group. C1&2; D1&2: Control and treatment group at seven-day interval and control and treatment group at 10-day interval respectively show superior healing process and decreasing of inflammatory reaction and formation of granulation tissue more regular than control group. H&E stain, 100×, 400×.