Teeth help us bite an apple and further helps us chew the apple piece into a more digestible matter. Each person has different set of teeth that not only help chewing and biting things, but also help tear off a thin cloth, grip things in your mouth and are a very good self-defense tools at times. You can just bite off an attacker and run for your life.
There are many more functions of the teeth. They help control the airflow through the mouth, thus making our speech much clearer and audible to hear. We can smile and control the facial muscles around the jaw. There are about 32 teeth in the human jaw. There are 16 teeth in the upper jaw and 16 teeth in the lower jaw. Humans grow their teeth in 2 sets.
Then, these 'milk teeth' will soon begin to loosen up and will fall out one by one from the root. Once the baby tooth falls off, a new tooth will take its place. This is the permanent tooth, if lost will never be replaced. Human teeth are called heterodonts.
Different types of Human Teeth
There are 4 incisors in the upper jaw and 4 in the lower jaw. Thus, there are a total of 8 incisors in humans. These help us to cut and bite food into smaller pieces, such that it can be easily chewed by the other teeth. Incisors are the first to appear in children. They are therefore also called baby teeth.
There are two canine teeth in the upper jaw and two in the lower jaw. The canines are said to be the longest teeth. They have a single root and are the only teeth with a single cusp, thus called cuspids. This means they have a round projection on the chewing surface of the tooth.
They are also called bicuspids as they have flat upper surface with at least 2 cusps. The function of pre-molars is to chew and crush food. There are a total of 8 pre-molars in the adult human mouth.
The last teeth in the back of the mouth are called molars. There are 3 molars in each quadrant, thus bringing the total to 12 molars. These teeth have the largest surface and help in chewing and grinding of food. Once the food is ground by the molars, it is swallowed.
There are 2 to 4 roots that anchor the molars into the jawbone. Third molars usually appear late in life and cause a lot of pain and discomfort. These teeth are called wisdom teeth. In most cases, one has to remove the wisdom teeth due to lack of space or an infection.
Human teeth are made up of enamel, dentin, pulp and cementum. It is important to maintain good dental health to avoid tooth infection, cavities, gingivitis, bad breath and even losing a tooth or two. A visit to the dentist may be one of the most scariest thing. But, it will surely help maintain a long-lasting smile.