What is the difference between laughing gas and oral sedation? Laughing gas, or nitrous oxide, is breathed in through a mask over your nose. The American Dental Association (ADA) says its effects wear off soon after the mask is removed. Oral sedation is medicine you swallow, and MedlinePlus advises arranging a responsible adult to drive you. Hanover Dental Care offers both, and at your consult you can ask which one fits your health history and the procedure.
What does laughing gas feel like, and when does it wear off?
The ADA says nitrous oxide is mixed with oxygen and inhaled through a small mask that fits over your nose. Within a few short minutes, you should start to feel its effects. The ADA calls it one option a dentist may offer for certain procedures.
What you may notice
The ADA describes light-headedness or a tingling in the arms and legs, and says some people feel their arms and legs get heavy. You can hear and respond to the dentist's requests. The effects wear off soon after the mask is removed. The page gives no minute count, so ask the team what to expect at your visit. Talk with your dentist about whether nitrous oxide would be a good option for you.
What is oral sedation in dentistry, and why do you need a ride home?
The ADA's page on anesthesia and sedation, last updated August 2025, says sedation may involve gases, pills or injected medicine. Oral sedation is the pill form, taken by mouth ahead of treatment. The ADA says dentists can give a sedative before or during dental procedures.
Why it takes longer to start
MedlinePlus writes about conscious sedation for medical and dental procedures in general. It says that if a provider gives the medicine to swallow, you feel the effects after about 30 to 60 minutes. That page is not specific to dental oral sedation, so ask the team what to expect. Side by side, the ADA says nitrous oxide starts within a few short minutes, while MedlinePlus says swallowed medicine takes about 30 to 60 minutes.
Why a ride home is advised
MedlinePlus, reviewed in January 2025, advises you to arrange a responsible adult to drive you to and from the clinic. It also says that when you are home you should avoid driving, using machinery, drinking alcohol and making legal decisions for at least 24 hours.
A 2007 dental-office review of mild oral sedation for adults advises a responsible adult escort and 24 hours without driving, important decisions or alcohol. It also says recovery varies between sedative medicines. Ask which medicine the team would use and how alert you will be.
Is sedation the same as numbing?
No. The ADA says some drugs control pain and some help you relax. Local anesthesia prevents pain in a specific area of your mouth by blocking the nerves that sense or transmit pain. The ADA's nitrous oxide page calls nitrous oxide a sedative agent inhaled to help you relax.
The ADA's page on easing dental anxiety says to tell your dentist if you feel pain even with a local anesthetic.
How do you and your dentist choose between laughing gas and oral sedation?
The ADA says you and your dentist discuss several factors. They include the type of procedure, your overall health, your history of allergies and your anxiety level. Hanover Dental Care offers both nitrous oxide and oral sedation. At your consult, ask which one fits your health history and the procedure. MedlinePlus says to tell your provider about your allergies and health conditions, the medicines you take and any sedation you have had before.
What else can help a nervous patient besides sedation?
The ADA's page on easing dental anxiety suggests speaking up, distracting yourself and using mindfulness. For speaking up, it says to tell the receptionist you are nervous when you book and remind the team when you arrive. It also suggests agreeing on a signal, such as raising your hand, if you need a break. For distraction, it suggests headphones with music or an audiobook, squeezing a stress ball or picturing a calm place.
Mindfulness, and more on nervous visits
For mindfulness, the ADA describes counting your breaths: inhale slowly, then exhale for the same number of counts. Our dental anxiety page covers what else can change a visit for a nervous patient. Our general and family dentistry page covers exams, cleanings and fillings, and mentions sedation for nervous patients.
What should you ask before the visit?
Ask what to do before the visit, including what to eat and drink, which of your medicines to take and who will drive you home. Ask whether the gas changes that, how aware you will be and what you may notice afterward. Ask whether you will also have numbing.
To talk through sedation, call Hanover Dental Care in Montpelier at (804) 544-2499, or send a message through our contact page.