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Effects of Nitrous Oxide

User Level:
Posted by: care2care  (10 years ago)

Dear all,

I am getting two fillings soon. I have always used the laughing gas in all the dental works that I have had in the past without any problems. However, the last time I had the Nitrous gas, I got lightheadedness then fall asleep for a few minutes or so, and when I woke up, the gas does not seem to have any effect on me anymore.

Is this a normal effect of the nitrous oxide or is it a problem? Has anyone else experienced this? I am somewhat concerned that I will experience this again with the laughing gas when I get the fillings done. I would be grateful for any input.
User Level:
Posted by: ghnane  (10 years ago)
Hi. It may be due to the fact that you are becoming desensitized against NO and the same doses that worked fine before need to be increased to achieve the same effect. What is the reason that you do not want local anesthesia instead of NO? NO is a vasodilator and thus lowers your blood pressure.
User Level:
Posted by: mdhola  (10 years ago)
Dear Care2care,
Light-headaches is normal with Nitrous oxide. Depending on percentage of Nitrous oxide, you might feel that it is not working. Most of time your dentist start with pure oxygen and then he switch to 50-60% nitrous and again they give oxygen at the the end of treatment. Whenever they give oxygen there is basically no sedative effect!

Main reason to give nitrous is to reduce the anxiety rather then to act as a pain killer or substitute of local anesthesia. So, even though you take the nitrous, your dentist will still give you local anesthesia as nitrous is just to reduce the anxiety level. Many times dentists turn nitrous on just during injecting anesthesia as it believe to be most stressful condition in dental chair; after injecting anesthesia many times they switch back to oxygen or reduce nitrous percentage. it really depend on procedure they are doing and also from patient to patient. You can discuss your condition to your dentist and he can explain you more about it and can adjust nitrous percentage based on that.

Hope it will help you!