What method is used to deliver nitrous oxide during dental procedures?

The method used to deliver nitrous oxide during dental procedures is through inhalation via a nasal mask. This delivery system allows for the safe and effective administration of nitrous oxide, often referred to as 'laughing gas.' When a patient inhales the gas through a nasal mask, it quickly enters the bloodstream and produces sedation by acting on the central nervous system.

Inhalation via a nasal mask is preferred because it provides immediate effects, is easy to regulate in terms of dosage, and allows for the patient's comfort throughout the procedure. The mask can be adjusted as needed or removed promptly if the patient experiences any adverse effects, making it a flexible and user-friendly option.

Other methods, such as intravenous injection or oral administration, are not appropriate for nitrous oxide delivery in dental contexts. Intravenous administration is typically used for different types of sedatives or anesthetics and doesn't offer the rapid adjustment that inhalation does. Oral administration would mean the gas must be converted to a form suitable for ingestion, which is not feasible for nitrous oxide. Subcutaneous injection is also unsuitable as it pertains to providing drugs through injection under the skin for other types of anesthetic or medication needs, not for gases like nitrous oxide.