When disc brakes for high performance cars arrived on the scene we began to hear of warped brake discs on road going cars, with the same analyses and diagnoses. Typically, the discs are resurfaced to cure the problem and, equally typically, after a relatively short time the roughness or vibration comes back.
As a result, the cheek teeth, like the incisors, have evolved to continuously grow throughout life. In other rodents, the diet of tubers, seeds, and grain requires little chewing, resulting in little wear of the cheek teeth.
The calendar shows the stages of development of baby and permanent teeth from the age of 5 months in the womb to 6 years. The permanent teeth are made to appear darker than the baby teeth. The growth patterns are clearly shown. The crowns of teeth are the first to form, followed by the roots.