The signal by which the number, position and nature of adult human teeth is known is called dental signal. Humans are diphyodont (grow twice) in nature. Babies have a total of 20 milk teeth in both jaws. Between the ages of 18-24, baby teeth fall out and 32 permanent teeth emerge. An adult human has four types of teeth. Incisor, Canine, Pre-molar and Molar.
1. Incisor: There are 4 incisor teeth in the front of each jaw. The teeth are sharp and suitable for tearing food. The incisors can exert a force equivalent to 55 pounds.
2. Canine: Each jaw has one incisor after the incisor. Its number is 2. The teeth are conical in shape and suitable for tearing hard food.
3. Pre-molar: Each jaw has two incisors after the incisors. Its number is 4. It involves chewing (mastication) and grinding food.
4. Molar: Each jaw has three molars after the incisors. Its number is 6. It chews and grinds food. Grinding teeth can exert a force equivalent to 200 pounds. Babies don’t have molars.