Facts about Teeth

1. 10

   Fluoride strengthens tooth enamel by replacing hydroxyl ions with fluoride ions, reducing cavity risk by approximately 25 percent in children and 15 percent in adults.

   TeethAug 18sharechemistrypreventionmeasurement
2. 09

   A single adult molar can exert bite force exceeding 1200 pounds per square inch, roughly equivalent to the force of a lion's bite.

   TeethMay 14sharebiologymeasurementanatomy
3. 08

   Sharks continuously shed and replace their teeth throughout life, while adult humans cannot grow new teeth after their permanent set emerges around age 21.

   TeethMay 14sharebiologyevolutioncomparison
4. 07

   Ancient Egyptians around 3000 BCE used a primitive toothpaste made from crushed rock, mint, and other ingredients to clean their teeth and treat decay.

   TeethMay 14shareancienthistoryhygiene
5. 06

   Tooth enamel cannot regenerate once damaged because it contains no living cells, making it the only tissue in the human body that cannot repair itself.

   TeethMay 14sharebiologyanatomyregeneration
6. 05

   Dentin, the layer beneath tooth enamel, contains microscopic tubules connecting to the nerve, causing sharp pain when exposed through wear or decay.

   TeethMay 14shareanatomybiologyphysiology
7. 04

   Chronic grinding of teeth, called bruxism, affects approximately 10 percent of the global population and can wear down enamel by 0.3 millimeters annually.

   TeethMay 14sharebiologyhealthmeasurement
8. 03

   At birth, babies possess 20 tooth buds beneath their gums that will eventually erupt as primary teeth within the first 36 months of life.

   TeethMay 14sharebiologydevelopmentchildhood
9. 02

   Humans grow two complete sets of teeth during their lifetime: 20 primary teeth by age 3 and 32 permanent teeth by age 21.

   TeethMay 14sharebiologydevelopmentanatomy
10. 01

    The enamel coating on human teeth is the hardest substance in the body, ranking 5 on the Mohs hardness scale.

    TeethMay 13sharebiologymeasurementchemistry