Believe it or not a wood cutting board is more sanitary than a plastic board. Any moisture on the surface of the wood cutting board is wicked into the interior (including bacteria that’s present in the moisture). Wood dries from the inside out, and bacteria can’t survive without moisture, so as the board dries the bacteria dies. A plastic cutting board will end up with cuts and grooves from use over time which gives the bacteria more places to hide and multiply on a plastic cutting board even after cleaning.