Yes, laughing gas is safe for children when a trained pediatric dentist gives it. Laughing gas, known in dentistry as nitrous oxide, is a mild sedative that a child breathes in through a small nose mask to feel calm during dental care. A systematic review of 25 studies with about 12,500 young patients, published in 2025, reported serious problems in fewer than 1% of cases, which places nitrous oxide among the safest sedation choices for kids.
Below we explain what laughing gas is, how it makes children feel, how long it lasts, what to expect before and after a visit, and how it compares to other forms of sedation. We answer the exact questions parents ask us most, using real data from pediatric dental and medical sources.
Is Laughing Gas Safe for Children?
Laughing gas is safe for children because it is a mild sedative that leaves the body within minutes and rarely causes anything beyond brief, minor side effects. Nitrous oxide has a long track record in pediatric dentistry, and the American Academy of Pediatric Dentistry has recognized nitrous oxide and oxygen as a safe and effective way to reduce anxiety in kids since 2005. That recognition rests on decades of clinical use and study.
The safety record shows up clearly in the numbers. A prospective safety study by Onody and colleagues, published in Drug Safety in 2006, tracked 35,828 administrations of a 50% nitrous oxide and oxygen mix and found the method well tolerated with only minor side effects. Minor side effects, such as brief nausea, appear in fewer than 10% of patients, according to published clinical trial data. When a trained pediatric dentist administers laughing gas with proper monitoring, serious complications are rare, occurring in under 1% of cases.
This strong safety profile is one reason we offer nitrous oxide as one of our in-office sedation options for nervous young patients. A safe sedative only helps, though, if parents understand what it actually is, so it helps to start with how nitrous oxide works.
What Is Laughing Gas and How Does It Work?
Laughing gas is nitrous oxide, a colorless gas that a child breathes in mixed with oxygen through a small mask that sits over the nose. Nitrous oxide reaches the brain quickly and produces a calm, relaxed feeling within 30 to 60 seconds, according to the 2025 systematic review noted above. The mask covers only the nose, not the mouth, so the dentist can still work on the teeth while your child breathes normally.
The mix your child breathes is carefully controlled. The American Academy of Pediatric Dentistry defines minimal sedation as nitrous oxide at 50% or less, with the rest of the mix being oxygen. Oxygen makes up the balance of every breath, which is why nitrous oxide keeps children comfortable without putting them under. At the end of the visit, we switch the flow to 100% oxygen at a recommended rate of 15 liters per minute, which clears the nitrous oxide from the body fast.
Clearing the gas quickly is what makes the effects fade almost as fast as they arrive. That quick fade shapes how the whole experience feels to a child, so parents often want to know exactly what their child will notice.
How Does Nitrous Make Kids Feel?
Nitrous oxide makes kids feel calm, light, and a little dreamy, often with warmth and gentle tingling in the hands and feet. This relaxed, floaty feeling is why the gas earned the name “laughing gas,” though most children simply grow quiet and content rather than giggly. Some kids report a pleasant warmth, and many barely remember the details of the procedure afterward.
Do You Act Silly After Laughing Gas?
Most kids do not act silly after laughing gas, because the calming effect fades within minutes once the mask comes off. A small number of children feel briefly lightheaded, giggly, or a bit disoriented right at the end, but this passes quickly. The relaxed feeling is designed to keep your child settled in the dental chair, not to make them act out.
That settled, still-aware state raises a fair question from many parents, since “sedation” can sound like sleep. It helps to clear up whether nitrous oxide actually puts a child to sleep.
Does Nitrous Oxide Put Kids to Sleep?
No, nitrous oxide does not put kids to sleep. Your child stays awake, aware, and able to talk and follow simple directions the whole time. Unlike general anesthesia, which causes full unconsciousness, nitrous oxide produces only minimal sedation, and the American Academy of Pediatrics notes that a patient on nitrous oxide maintains verbal communication throughout the procedure.
Staying awake is exactly the point. A child who can hear us, answer us, and breathe on their own is a child who stays in control of their own airway, which is a big part of why this method is so safe. Awake and aware does not mean uncomfortable, though, so the next thing parents ask about is pain.
Do You Still Feel Pain on Laughing Gas?
Laughing gas reduces pain and anxiety, but for procedures like fillings we usually pair it with local anesthesia so your child feels no pain at all. Nitrous oxide raises a child’s comfort and dulls discomfort, and in some short procedures a child may not need to be numbed. Local anesthesia handles the deeper numbing for restorative work.
Numbing the tooth is where laughing gas and local anesthesia work as a team. Nitrous oxide takes the edge off the fear of the needle, which makes giving the local anesthetic much easier, and the local anesthetic then blocks the pain of the actual treatment. Parents who bring kids in for dental fillings often notice the visit goes smoother because the two work together.
Does Laughing Gas Hurt?
Laughing gas does not hurt at all, because your child simply breathes it in through a soft nose mask. There are no needles, no shots, and no pressure involved in the gas itself. Many masks even carry a light scent, such as bubble gum or strawberry, which helps young children accept the mask without fuss.
Comfort during the visit matters most for kids who arrive scared, and dental fear is far more common than many parents realize. That reality is what makes the calming effect of nitrous oxide so valuable.
Can Laughing Gas Relieve Anxiety?
Yes, laughing gas relieves anxiety, and easing dental anxiety is its main purpose in pediatric dentistry. Dental anxiety affects a large share of children. A 2024 meta-analysis in ScienceDirect that pooled 25 studies estimated that about 30% of children ages 2 to 6 experience dental fear and anxiety, and a separate meta-analysis put the figure at 23.9% across ages 3 to 18.
Anxiety this common has real consequences. The same 2024 analysis found that children with no prior dental visit had higher odds of dental fear, with an odds ratio of 1.37, which means fear often grows when kids avoid the dentist. Nitrous oxide breaks that cycle by making early visits calm, and a positive first visit sets the tone for a lifetime of confident dental care.
Because it works best for mild to moderate anxiety, nitrous oxide fits a wide range of children, and calm visits make it easier to stay on top of steps that prevent cavities. That comfort brings up the practical question of age and how long a child can safely stay on it.
Is Laughing Gas Ok for a 7 Year Old?
Yes, laughing gas is ok for a 7 year old, and it works well for most school-age children who can breathe through a nose mask and follow simple instructions. Age itself is not the main factor, because the American Academy of Pediatric Dentistry supports nitrous oxide use across a wide range of pediatric ages when a child can cooperate with the mask. A 7 year old is usually a strong candidate.
How Long Can a Kid Be on Nitrous Oxide?
A kid can be on nitrous oxide for the length of the procedure, whether that is a few minutes or the better part of an hour, because the gas is continuously balanced with oxygen. Continuous oxygen in every breath is what allows safe use throughout the appointment under a trained dentist’s monitoring. At our Yorktown Heights office, we adjust the pediatric sedation level to your child’s comfort and stop the gas as soon as the treatment is done.
Some children are better suited to nitrous oxide than others, and a short candidacy check happens before any gas is given. Good candidacy also depends on a few simple steps parents can take before the visit, starting with what a child eats.
Can a Child Eat Before Laughing Gas?
A child can have a light meal before laughing gas, but a heavy meal right beforehand is best avoided to lower the small chance of nausea. Guidance from the Royal Children’s Hospital suggests a light meal, such as soup or toast, and a drink up to about two hours before the procedure, then nothing after that until the visit is over. A lighter stomach keeps your child more comfortable.
We give clear eating instructions when we schedule sedation, so parents always know what to do. Following those simple steps sets up a smooth appointment, which naturally leads to what happens once the visit is finished.
What to Expect After a Child Has Laughing Gas?
After a child has laughing gas, expect them to return to their normal self within minutes, with no lasting drowsiness or grogginess. Returning to normal quickly is one of the biggest advantages of nitrous oxide over other sedatives. Children’s Nebraska notes that once the mask is removed, nitrous oxide wears off very quickly and most children return to their pre-nitrous state comfortably.
A few children feel briefly off afterward. Here are the mild, short-lived side effects that can occur:
- Mild nausea, which usually settles quickly with a few sips of water
- A brief headache
- Short-lived lightheadedness or dizziness
- Brief irritability or feeling a little disoriented
These effects fade fast because the gas leaves the body so quickly. Just how quickly it clears is the next thing most parents want pinned down with real numbers.
How Long Does Laughing Gas Last in the System?
Laughing gas lasts only a few minutes in the system, and full recovery typically happens within about five minutes of removing the mask. The 2025 systematic review reported an onset of 30 to 60 seconds and full recovery in roughly five minutes, which makes nitrous oxide the fastest-clearing sedation option in common pediatric use. Breathing pure oxygen at the end speeds this clearance even more.
How Long Does It Take to Feel Normal After Laughing Gas?
It takes about five minutes to feel normal after laughing gas for most children, and rarely longer than the short observation period at the end of the visit. This quick return to normal is why children usually walk out steady and alert. The table below compares nitrous oxide with the two other sedation levels used in pediatric dentistry.
| Feature | Nitrous Oxide (Laughing Gas) | Oral Conscious Sedation | General Anesthesia |
|---|---|---|---|
| Level of consciousness | Awake and aware | Drowsy, may doze | Fully unconscious |
| How it is given | Nose mask, inhaled | Pill or liquid by mouth | IV or inhaled, hospital or surgical setting |
| Onset | 30 to 60 seconds | About 30 to 60 minutes | Minutes, in a controlled setting |
| Recovery | About 5 minutes | Several hours | Hours, with monitored recovery |
| Serious complication rate | Under 1% | Low, higher than nitrous | Low but highest of the three |
| Best for | Mild to moderate anxiety, short visits | Younger kids, harder to settle | Extensive work, special needs, very young |
Sources: American Academy of Pediatric Dentistry guidelines; Onody et al., Drug Safety, 2006; systematic review of pediatric sedation, PMC, 2025; American Academy of Pediatrics sedation guidelines.
Fast recovery does more than end the visit smoothly. It also decides how soon a child can get back to a normal day, which is why so many parents ask about school.
Can My Kid Go Back to School After Laughing Gas?
Yes, your kid can go back to school after laughing gas, since the gas clears within minutes and leaves no lingering drowsiness. Returning to normal activity the same day is standard with nitrous oxide, and Children’s Nebraska confirms that children may return to regular activities once they are home and comfortable. Many families head straight back to school or work after an appointment.
The one thing to watch is local anesthesia, if your child received it for a filling. A numb lip or cheek can last an hour or two, so we remind kids not to bite the numb area until the feeling returns. Aside from that, a normal day is fine, and most kids are ready for their next routine cleaning without a second thought.
Which Is Safer, Laughing Gas or Anesthesia?
Laughing gas is safer than general anesthesia for routine pediatric dental care, because it produces only minimal sedation and clears the body within minutes. Minimal sedation keeps your child awake and breathing on their own, while general anesthesia causes full unconsciousness and requires a hospital or surgical setting with deeper monitoring. Both are safe in the right hands, but nitrous oxide carries the lower risk profile for everyday visits.
What Is the Safest Form of Sedation for Children?
Nitrous oxide is widely considered the safest form of sedation for children for routine dental treatment, thanks to its minimal sedation level, fast recovery, and serious complication rate under 1%. This safety record was supported by the 35,828-administration study noted earlier and by AAPD recognition of nitrous oxide and oxygen as safe and effective. General anesthesia stays reserved for extensive procedures or children who cannot be treated any other way.
Here is what a typical nitrous oxide visit looks like from start to finish:
- We review your child’s health history and confirm nitrous oxide is a good fit.
- Your child breathes a mix of nitrous oxide and oxygen through a soft nose mask.
- Within about a minute, your child feels calm and relaxed.
- We complete the dental treatment, adding local anesthesia if the procedure needs it.
- We switch to 100% oxygen to clear the gas from the body.
- Your child returns to normal within about five minutes and can go about the day.
Understanding each step helps parents feel confident about choosing nitrous oxide. A few more common questions come up often enough that they deserve direct answers.
Frequently Asked Questions
Is Laughing Gas Ok for Kids at the Dentist?
Yes, laughing gas is ok for kids at the dentist and is one of the most common sedation methods in pediatric dentistry. The American Academy of Pediatric Dentistry recognizes nitrous oxide and oxygen as safe and effective for children. A trained pediatric dentist controls the mix and monitors your child throughout the visit.
What Are the Side Effects of Laughing Gas in Children?
The side effects of laughing gas in children are mild and short-lived, mainly brief nausea, headache, or lightheadedness. These effects appear in fewer than 10% of patients and usually clear within minutes of removing the mask. There are no known long-term side effects from nitrous oxide used in dental care.
Who Should Not Use Laughing Gas?
Children who should not use laughing gas include those with certain respiratory blockages, specific vitamin B12 or folic acid deficiencies, or a few other medical conditions noted in AAPD protocols. A child who cannot breathe through the nose, such as during a heavy cold, may also be a poor fit that day. We review each child’s health history first to confirm nitrous oxide is the right choice.
How Much Oxygen Is Given With Laughing Gas?
Oxygen makes up at least half of every breath given with laughing gas, since the American Academy of Pediatric Dentistry defines minimal sedation as nitrous oxide at 50% or less. At the end of the visit, the flow switches to 100% oxygen, often at 15 liters per minute, to clear the gas quickly. Oxygen in every breath is a core safety feature of this method.
Can Laughing Gas Be Used With Numbing Medicine?
Yes, laughing gas can be used with numbing medicine, and the two are often used together for fillings and similar procedures. Laughing gas eases anxiety and the fear of the needle, while local anesthesia blocks the pain of the treatment itself. Using both keeps your child calm and pain-free during restorative care.
Does Laughing Gas Work for Children With Special Needs?
Laughing gas works well for many children with special needs, because it is gentle, flexible, and keeps the child awake and responsive. Our pediatric dentists have specific training in caring for children with a wide range of needs, including anxiety and behavioral challenges. We adjust each visit to the individual child to keep them comfortable.
The Bottom Line
Laughing gas is a safe, gentle, and well-studied way to help children stay calm at the dentist, with serious complications in under 1% of cases and full recovery in about five minutes. Nitrous oxide keeps your child awake and aware, eases the anxiety that affects roughly a third of young kids, and lets your child return to a normal day right after the visit. For most routine pediatric care, it is the safest sedation choice available.
If your child feels nervous about an upcoming visit, we are always happy to talk through whether nitrous oxide is a good fit. The team at Cohen Family Smiles in Yorktown Heights welcomes your questions, and you can reach out to us whenever you would like to learn more or plan a comfortable appointment for your child.
