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Oral cancer models have attempted to demonstrate inhibition of oral carcinogenesis. These models used synthetic carcinogens, lacked a specific mechanism of activity or used non-physiologic doses for carcinogen or inhibitor. To correct these problems the tobacco and environmental carcinogen, dibenzo[a,l]pyrene (DB[a,l]P) (0.25%, 0.010 μM/application) was painted on the tongue and/or vitamin E acid...
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