Cuspidal structures are observed in virtually all fossil and extant groups: shark scales can be tricuspidate in some places of their body, placoderm "tubercles" on jaw-bones and body dermal bones are multi-cuspidate [ 58], teleost fishes display a variety of tooth shapes including multi-cuspidate ones [ 33], and mammals have variations in the number of cuspids on their teeth [ 60].
At the world track championships in Paris, a number of athletes wore braces on their teeth.
Some are young, with pencil eyebrows and hoop earrings; others have accents and lipstick on their teeth.
So Brontes adapted the technology for use in an oral scanner that could create images of the mouths of patients who needed new crowns on their teeth.
To figure out what they ate, we have to dig up their bones and study the wear patterns on their teeth.
Without tools, emergent hominins would have relied on the versatility and strength of their hands to collect food and on their teeth and jaws alone to process it.
In one study, a group of volunteers were followed for three weeks as researchers examined the impact of brushing on their teeth after they drank diet soda.
Bulimic men, like bulimic women, can suffer electrolyte imbalances, intestinal problems, enlarged salivary glands and erosion of the enamel on their teeth.
And the work with rats suggests that adults - who already have Streptococcus mutans on their teeth - will be protected by the same simple process.
They normally acquire Streptococcus mutans via contaminated saliva from their mother," says Hillman. "The child would simply visit their dentist for a squirt of solution on their teeth".
"But teeth grinders, especially at night without restraint, can exert up to as much as 200 pounds per square inch on their teeth".
