A wood-expert-friend told me not only that oak's toxic but also that, because of this, it's actually illegal in England (or UK) to make chopping boards out of it! I was trying to check this out (due to seeing oak chopping boards on sale in Sainsbury's!) when I found your forum. I did find that oak is indeed toxic, but haven't been able to confirm the law bit yet - anyone here able to either confirm or disprove it? Thank you.