Is nitrous oxide safe?

It is totally safe. Nitrous oxide is considered the safest sedation agent for anxiety control during dental or medical treatment. It is a low-potency anesthetic that is completely eliminated from the body after a sedation session.

The beneficial effects of nitrous oxide are even highly recommended for reducing stress in patients with certain medical conditions such as angina, hypertension or who have had a heart attack in the past. Unlike general anaesthesia, sedation with nitrous oxide allows the patient to remain fully conscious.