Final answer:
Nitrous oxide, also known as laughing gas, does not require a permit for medical use in the United States.
Step-by-step explanation:
Nitrous oxide, commonly known as laughing gas, is often used for sedation during dental procedures. In the United States, a permit is not required for the use of nitrous oxide for medical purposes. However, it is important to note that the regulations regarding the use of nitrous oxide may vary in different countries or states. It is advisable to consult with a local healthcare professional or regulatory authority to ensure compliance with any specific requirements.
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