Sedation & Anxiety
Nitrous oxide (happy gas)
A light, breathable gas that helps you relax during dental treatment.
Type
Inhaled sedation
You are
Awake and relaxed
Recovery
Usually quick
Driving
Often okay after
Overview
Nitrous oxide, often called happy gas, is a mild form of sedation breathed in through a small mask over your nose. It helps you feel calm while staying awake and able to respond.
The effects come on quickly and wear off soon after the mask is removed. For most people this means you can drive yourself home.
What to know
- Helps you relax while staying awake and aware
- Breathed in through a soft nose mask
- Effects start and wear off quickly
- Most people can drive home afterwards
- Suitable for many adults and children
Common questions
Will I be asleep?
No. You stay awake and can talk to us, just more relaxed.
How does it feel?
Many people feel calm, warm and a little light-headed.
How long until it wears off?
Usually within minutes once the mask is taken off and you breathe normally.
Is it safe for children?
It is often used for children, after individual assessment by your dentist.
Can everyone have it?
Most people can, but tell us your full medical history first so we can check.
Related topics
Dr Rick Iskandar · Reviewed June 2026