Think you have what it takes to win the dental trivia “crown?” Test your knowledge with these fun and interesting questions. (Answers are below.)

1. How many permanent teeth do adults have?

  1. 24
  2. 28
  3. 32
  4. 36

2. True or false: Tooth enamel is the hardest substance in the human body.

3. When you lose tooth enamel, how long does it take to grow back?

  1. 10 days
  2. 2 weeks
  3. 6 months
  4. Tooth enamel doesn’t grow back

4. True or false: George Washington wore wooden dentures.

5. A toothache can be caused by:

  1. Tooth decay
  2. Teeth grinding
  3. Infected gums
  4. All of the above

6. True or false: In ancient times, people thought that tiny worms inside teeth were the cause of cavities.

7. Known as, “nature’s cavity fighter,” _________ also helps repair the early stages of tooth decay and strengthen tooth enamel.

  1. Calcium
  2. Fluoride
  3. Iron
  4. Copper

8. True or false: No 2 teeth are exactly the same shape and size.


  1. C. At birth people usually have 20 baby (primary) teeth, which start to come in around 6 months of age. They fall out at various times throughout childhood. By age 21, all 32 of the permanent teeth have usually erupted.1
  2. True. Tooth enamel is stronger than bone and made of 96% mineral—the highest of any tissue in the human body.2
  3. D. Tooth enamel doesn’t contain any living cells and cannot repair itself. Once it’s gone, tooth enamel can’t grow back.3
  4. False. Although Washington did wear dentures, they were never wooden. His many pairs were built from different materials including hippopotamus ivory, bone, gold wire, copper screws, lead and even human teeth.4
  5. D. In fact, toothaches can also be caused by an abscessed tooth, a tooth fracture or damaged filling.5
  6. True. The concept of tooth worms dates back to 5000 B.C. They were also mentioned in ancient Chinese scripts from 1500 B.C., and people in the Roman Empire and Middle Ages also thought tooth worms were real.6
  7. B. A naturally occurring mineral, fluoride helps prevent cavities in children and adults.7
  8. True. Each tooth in your mouth is unique, even if they’re the same type of tooth (molar, incisor, etc.). Teeth also vary widely from person to person.8

Humana offers dental plans

If you’re looking for dental insurance, Humana can help. We offer a broad range of dental plans with varying levels of coverage, many with affordable monthly premiums. Some of our plans also feature no waiting periods, which means you could get covered in about 5 days. To see plans and prices in your area, check out our Humana dental insurance page.

Related articles


Individual and family dental insurance plans

From budget-friendly monthly premiums to low office-visit copays, Humana has a dental plan that is sure to fit your needs.

View plans and prices available in your area

Enroll by phone

Monday – Friday 8 a.m. – 9 p.m. Eastern time

1-855-202-4081 (TTY: 711)

Find a dentist

See if your dentist is in our network


  1. “Eruption Charts,” American Dental Association, last accessed October 28, 2022,
  2. “What’s the Hardest Substance in the Human Body?,” Healthline, last accessed October 28, 2022,
  3. “Tooth Enamel Erosion: What You Should Know,” Healthline, last accessed October 28, 2022,
  4. “Presi-dental Health: 4 Strange (But True) Tales,” American Dental Association, last accessed October 28, 2022,
  5. “Dental Health and Toothaches,” WebMD, last accessed October 28, 2022,
  6. “Debunking the Myth of Tooth Worms and Other Cavity Causes,” Healthline, last accessed October 28, 2022,
  7. “Fluoride,” American Dental Association, last accessed October 28, 2022,
  8. “10 Things You Didn’t Know About Your Teeth,“ Healthline, last accessed October 28, 2022,