Can you smile or show your teeth in a passport photo?

Mostly no. The UK, Canada and Australia require a neutral expression with your mouth closed, and India says no grinning; the US passport page allows a smile with your mouth closed but no teeth.

Rules checked on · official sources only

What each country says

CountryAnswerOfficial quoteSourceChecked
United StatesPassport Yes, you can smile, but keep your mouth closed and avoid exaggerated expressions; the online-renewal page says avoid showing teeth. Avoid exaggerated facial expressions. You can smile in your photo. Just make sure your eyes are open and your mouth is closed. Use a neutral facial expression or natural smile. Avoid showing teeth. travel.state.gov
travel.state.gov
United Kingdom No. You need a plain expression with your mouth closed. Examiners may accept a relaxed mouth with teeth visible if facial features aren't distorted. be facing forwards and looking straight at the camera have a plain expression and your mouth closed You must accept the photo when: the customer’s mouth is relaxed and: their teeth are visible or lips are slightly open their facial features are not distorted gov.uk
HM Passport Office examiner guidance
Canada No. A neutral expression is required: mouth closed, not smiling or frowning. A neutral facial expression means that: your eyes are open and clearly visible you’re looking straight at the camera your mouth is closed you’re not smiling or frowning canada.ca
Australia No. Anyone over 3 must have a neutral expression with eyes open; smiling is not permitted. Children under 3 may have their mouth open. Anyone over 3 years old must face the camera straight on, with eyes open and a neutral expression. Smiling is not permitted – must be a neutral expression passports.gov.au
passports.gov.au (PDF)
India No grinning. The facial expression should be natural. Showing teeth is not mentioned separately. Expression of the face should be natural (no grinning, frowning or raised eyebrows) passportindia.gov.in
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Answers quote the official pages linked above. Not affiliated with any government. Final acceptance is up to the issuing authority.