My six-year-old was given nitrous oxide during a routine filling, despite the fact that I had told the woman who gave us the paperwork that I did NOT want him drugged like that. When my husband returned from the bathroom, he found the mask already on our son. When he complained, he was told it wasn't optional, and was then charged for it. I'm absolutely LIVID that our wishes were circumvented. We do not take risks with our child's life, and are furious that this place did!