Boob Scoop: Mothers often delay a dental visit because they're concerned that if they receive local anesthesia, the medication will be passed onto their breastmilk. However, most medications used for oral and IV sedation are considered compatible with breastfeeding. Therefore, there is no need to interrupt breastfeeding after receiving novocaine or other local anesthesias, such as bupivacaine and lidocaine. In addition, Nitrous oxide (laughing gas) sedation is also compatible with breastfeeding because it is insoluble in the bloodstream. That is, once administered, it goes from your brain to your lungs, to the room air, immediately after you stop ingesting it.
Sharen Medrano, Yummy Mummy Support Group IBCLC (www.nycbreastfeeding.com)