Among adolescents ages 12 to 19, more than half (57%) have had cavities in their permanent teeth. Among adults aged 20 and older, about 90% have had at least one cavity. Almost everyone has one or two cavities in their lifetime, even with good dental hygiene. The average American adult has three fillings.
But if you tend to have a lot of cavities, you might wonder why. For Americans between the ages of 20 and 34, the average is just under 27 teeth (26.90) remaining. By the time you reach 49 years old, you're likely to have an average of 25.05 teeth. Once you reach 64 years old, you'll be quite normal if you have around 22 (22.30) teeth still in your mouth.
Studies show that more than 90% of Americans have some level of tooth decay, while 25% have one or more cavities that haven't yet been filled.