A new experiment with dogs finds that Bisphenol-A (BPA) can be absorbed in the mouth and pass directly into the bloodstream, just as nitroglycerin under the tongue. This way it bypasses detoxification in the liver after absorption in the gut. The result is that much more biologically active BPA is available to possibly cause health effects, with major implications for how much risk BPA may pose for human health.
Read BPA is absorbed in the mouth; could explain high blood levels, by John Peterson Myers, EHN, Jun 19, 2013
Sources: High Bioavailability of Bisphenol A from Sublingual Exposure
Environmental Health Perspectives, 12 June 2013, Full PDF