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.
During the period the teeth are growing, sheep. are referred to by the number of permanent. incisors present, such as two-tooth, four-tooth, six-tooth, eight-tooth or full mouth. The accompanying diagram sets out the. development of the permanent incisors and the. variation in age at which they may erupt.