Older Nitrous machines in dental offices allowed one to give up to 100% nitrous, meaning there is 0 oxygen. Nitrous machines now days in dental offices make it impossible to give more than 70% nitrous meaning you have plenty of oxygen. This is of course unless you inhale it directly from the nitrous tank. Chronic nitrous oxide use leads to neuropathies and a disabled dentist at some point.
Older Nitrous machines in dental offices allowed one to give up to 100% nitrous, meaning there is 0 oxygen. Nitrous machines now days in dental offices make it impossible to give more than 70% nitrous meaning you have plenty of oxygen. This is of course unless you inhale it directly from the nitrous tank. Chronic nitrous oxide use leads to neuropathies and a disabled dentist at some point.