National Smile Day 2027: Date, History & Ideas

National Smile Day 2027 — Date, History & How to Celebrate in the USA

National Smile Day 2027 falls on Monday, May 31. This guide gives the date through 2035, the history behind the observance, smile and oral-health facts, and practical ways to celebrate at home, school or work.

When Is National Smile Day in 2027?

National Smile Day is an annual awareness observance that encourages people to share genuine smiles and look after their oral health. According to Calendarena’s calendar data, it falls on May 31 every year, so National Smile Day 2027 lands on Monday, May 31, 2027. The 2026 date, Sunday, May 31, 2026, has already passed. The table below lists every date from 2025 to 2035 with the day of the week, so teachers, managers and dental offices can plan well ahead.

Because the date is fixed, the weekday moves forward by one day each year, and by two days when a leap day falls in between, as it does in 2028. That is why a Monday in 2027 becomes a Wednesday in 2028. The weekday matters for planning: a Monday celebration suits a classroom or a team meeting, while a Saturday date such as 2031 works better for family activities and community events.

National Smile Day Quick Facts

• Name: National Smile Day
• Date in 2027: Monday, May 31, 2027 (observed annually on May 31)
• Type: Awareness observance, not a federal holiday
• Founders: Credited to dentists Dr. Tim Stirneman and Jim Wojdyla
• Purpose: Share genuine smiles, support well-being and promote oral health
• Ways to take part: Smile at someone, tell a joke, book a dental checkup

National Smile Day History & Meaning

The observance was created by dental professionals who wanted to highlight how much a healthy smile contributes to confidence, friendliness and everyday communication. Dentists Dr. Tim Stirneman and Jim Wojdyla are credited as its co-founders. The idea is simple: a smile costs nothing, is understood in every language, and encourages a kind response from the person who receives it.

National Smile Day has no statutory basis. No federal law or presidential proclamation sets it, and it does not close schools, banks, post offices or government agencies. It belongs to the large family of unofficial national days that organizations, dentists, schools and families adopt voluntarily. That informal status explains why its celebrations vary so much, from a quick compliment at the office to a free toothbrush giveaway at a local dental practice.

National Smile Day vs. World Smile Day

World Smile Day is a different observance, held on the first Friday of October. It was initiated by Harvey Ball, the commercial artist who created the yellow smiley face in 1963, and the first edition took place in 1999 in Worcester, Massachusetts. After Ball died in 2001, the Harvey Ball World Smile Foundation was established, and it continues to sponsor the day. Its motto is “Do an act of kindness. Help one person smile.”

World Smile Day fell on Friday, October 2, 2026, and it falls on Friday, October 1, 2027. National Smile Day, by contrast, stays tied to May 31 and centers on smiles and oral health. People also search for the October event as International Smile Day, and the two names are often mixed up, so check the date before you plan an event.

Why a Smile Matters: Well-Being and Oral Health

Researchers have studied for decades whether smiling influences mood and stress. The findings are mixed, and a smile is no replacement for medical or mental health care. What is easier to observe is the social effect: a friendly expression makes conversations smoother, signals openness and often prompts the other person to smile back. That small exchange is the idea at the heart of the day.

The second theme is the health of the teeth and gums behind the smile. The Centers for Disease Control and Prevention publishes guidance on oral health covering cavities, gum disease, fluoride and dental sealants. Dental organizations commonly recommend the same basic routine:

1. Brush twice a day for two minutes with a fluoride toothpaste.
2. Clean between your teeth once a day with floss or an interdental brush.
3. Limit sugary drinks and snacks, especially between meals.
4. Replace your toothbrush about every three months, or after an illness.
5. Book regular dental checkups, as often as your dentist advises.
   National Smile Day is a convenient reminder to schedule the appointment you have been postponing.

Is National Smile Day Observed Outside the USA?

People look up the date in the United States, India, the United Kingdom, Canada and Australia. In all of these countries it remains an informal awareness day. It is not a public holiday in any of them, and schools, shops and offices operate as usual. The date does not change from one country to another, because it follows the calendar rather than a local rule: it is May 31 everywhere.

Time zones can still cause confusion for online celebrations. A post published on the evening of May 30 in California is already May 31 in India and Australia, so international teams should agree on a shared posting time if they want everyone to join in on the same day.

Ways to Celebrate National Smile Day

You do not need a budget or an event permit to take part. These ideas work for individuals, families and organizations:

• At home: Start the day by greeting each family member with a genuine smile, then share a favorite funny memory at dinner.
• At school: Teachers can run a kindness activity, such as writing compliment cards for classmates, or a short lesson on tooth brushing and nutrition.
• At work: Open the meeting with a light joke, thank a colleague by name, or hold a ten-minute coffee break focused on good news.
• At the dentist: Dental offices often mark the day with checkup reminders, oral-hygiene tips or small gifts such as toothbrushes. Ask your own practice what it offers.
• Online: Post a smiling photo or a short thank-you message with the hashtag #NationalSmileDay, and tag the person who made you smile recently.
• In your community: Volunteer at a nursing home, send a card to a neighbor, or help a local group that supports children’s dental care.
  If you organize a group activity, keep it short and inclusive. A five-minute smile challenge, a shared message board or a simple thank-you round gives everyone a way to join without pressure. Offer quieter alternatives for people who prefer not to be photographed, because a genuine smile matters more than a posted picture, and the goal is comfort and kindness for everybody involved.

Planning Around Monday, May 31, 2027

Is May 31, 2027 a federal holiday? Yes — Memorial Day falls on the last Monday of May, and in 2027 that Monday is May 31. National Smile Day therefore coincides with a federal holiday, when most offices, schools and many dental practices are closed.

The overlap changes how you should plan. Choose indoor or outdoor family activities, a neighborhood gathering or an online message rather than a workplace event or a dentist visit. The same overlap happens again in 2032, the next year in the table when May 31 falls on a Monday. In every other year from 2028 to 2031 and from 2033 to 2035, National Smile Day does not fall on Memorial Day.

Holidays & Celebrations in the Next Days

Frequently Asked Questions about National Smile Day

Q: When is National Smile Day in 2027?
A: National Smile Day 2027 is on Monday, May 31, 2027. It falls on May 31 every year, so the date never changes, only the weekday.

Q: What day is National Smile Day in 2028?
A: National Smile Day 2028 is on Wednesday, May 31, 2028. The weekday shifts by two days because 2028 contains a leap day.

Q: Is today National Smile Day?
A: Only if today is May 31. On any other date the answer is no, and the countdown at the top of this page shows how many days remain.

Q: Is National Smile Day the same as World Smile Day?
A: No. World Smile Day is held on the first Friday of October and was started by Harvey Ball. National Smile Day is observed on May 31.

Q: Is National Smile Day a federal holiday?
A: No. It is an awareness observance without legal status. Schools, banks and government offices stay open unless May 31 coincides with Memorial Day, as in 2027.

Q: When was National Smile Day in 2025 and 2026?
A: In 2025 it was Saturday, May 31, 2025. In 2026 it was Sunday, May 31, 2026. Both dates have already passed.

Q: Is Smile Day celebrated in India, the UK, Canada or Australia?
A: Yes, informally. People in these countries share smiles and kind messages on May 31, but the day is not an official public holiday there.

Q: What is the best way to celebrate National Smile Day?
A: Share a genuine smile, do one kind act, and book a dental checkup. Each takes a few minutes and costs little or nothing.

Related Holidays & Calendars

Plan the surrounding weeks with the May 2027 calendar, or browse more dates in our USA holidays and observances section.