Crown of tooth in adult, worn down.
"A Manual of Elementary Geology" by Charles Lyell
The skull of one adult male bears an extra peglike tooth posterior to M3 on the right side.
"Systematics of Megachiropteran Bats in the Solomon Islands" by Carleton J. Phillips
By far , most adult tooth loss (about 75%) is caused by periodontal disease, not tooth decay.
Over time, adult teeth often darken due to changes in the mineral structure of the tooth.
Men tended to consume more sugar than women, and adolescents and young adults had the biggest sweet tooths, getting about 16% of their total calories from added sugars.
Plaque , the sticky film of material that grows on and around your teeth, is the primary cause of tooth decay, gum disease, and tooth loss in adults.