Final answer:
Monitoring the patient while under nitrous oxide sedation is important to prevent adverse reactions.
Step-by-step explanation:
Monitoring the patient while under nitrous oxide sedation is important to assure that adverse reactions do not occur. This is true. Nitrous oxide, commonly known as laughing gas, is a sedative gas that is used in dentistry and other medical procedures to reduce pain and anxiety. While it is generally safe, it can cause adverse reactions, such as dizziness, nausea, or even loss of consciousness in rare cases.