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.
1 Lower incisors are usually the first teeth to erupt at about 6 months. 2  All 20 primary teeth are usually in the mouth by about 2 years. 3  There are 32 permanent teeth including 4 wisdom teeth. 4  The first permanent teeth to erupt (usually at about 6 years) are the 4 first permanent molars behind the last primary teeth.he molars are the largest of the teeth. They have a large flat biting surface. The function of the molars is to chew, crush and grind food. There are eight molars in the primary dentition and twelve in the permanent dentition.