To provide the answer, lets start with the fact that adults are supposed to have 32 permanent teeth. However, the vast majority of people in the United States have their 4 wisdom teeth or 3 rd Molars extracted as teenagers, leaving the average American with a complement of 28 teeth.
Of these 28 teeth, each person has 14 in their upper jaw and 14 in their lower jaw. Within each jaw, you have 4 incisors, 2 canines, 4 premolars, and 4 molars. If you lose a single tooth, the options for replacement are rather consistent. You could use a dental implant, a bridge, or a removable partial denture. There are different types of cementum.
Other types of cementum, such as cellular mixed stratified cementum CMSC , cover other parts of the roots. The center of the tooth contains dental pulp, which consists of loose tissues, including nerves, blood vessels, and connective tissues. If any bacteria get past the enamel and dentin, the pulp becomes inflamed in an attempt to protect the tooth. Inflammation of the pulp can cause pulpitis, which can be very painful. The dental pulp attacks the bacteria with antibacterial, immune, and inflammatory responses.
This may cause the body to reject and fight off the bacterial infection. However, if this does not happen, the dental pulp may remain inflamed. This causes part of the pulp to die and can cause a root canal infection. While teeth help people talk, their primary function is to chew.
The teeth cut and grind food into little chunks, which allows a person to swallow and digest it easily. A person can learn more about teeth names, types, and functions here. Incisors cut food up into smaller pieces, which the teeth and tongue then move to the back of the mouth. The canine teeth are the teeth that are slightly more pointed than the others. As well as cutting up and tearing food, these teeth make sure that the upper and lower rows of teeth do not clash.
The shape of the canines allows them to guide the rows of teeth so that they smoothly slide off each other when the jaw moves. These are the larger teeth that sit behind the canines. Humans have four along the top gums, and four along the bottom, two on each side.
These sit toward the back of the mouth, and most adults typically have eight molars, with a first and second molar on each side of the mouth. Third molars, or wisdom teeth, sit right at the back of the mouth. Some people do not develop wisdom teeth. The function of the molars is to grind up the food into smaller pieces to help people swallow easily.
The first set teeth, or baby teeth, begin to emerge when an infant is about 5 months old, and they will typically have their first full set by the age of 3. Baby teeth do not include premolars. When a child reaches about 6 years old, their baby teeth will start to fall out, and adult teeth will replace them. To help maintain a healthy mouth, the best way to take care of teeth is by brushing and flossing regularly.
This is not uncommon and should stop when the gums become healthy after regular cleaning and flossing. Premolars are positioned next to your canine teeth. A full set of adult teeth will normally contain eight premolars with 4 on the top and 4 on the bottom row of teeth. We rely on these teeth for grinding and crushing chunks of food. These teeth are bigger and wider with a flat surface area on the bottom unlike your narrow and sharp front teeth.
Find more on looking after your teeth in our teeth cleaning guide The parts of our teeth The crown is the part of the tooth which is visible to you above the gum line.
The enamel covers the crown and is hard and shiny, in fact enamel is the hardest material present in the body and acts to protect the sensitive inner parts of the tooth. The dentine makes up most of the tooth and protects the inner part called the pulp. The pulp collects each tooth's blood supply and nerve endings, a strong blood supply keeps the tooth alive and healthy and the nerve endings help to send messages to your brain alerting you to the temperature of your food or if the tooth is damaged or decayed.
The cementum covers and protects the root of the tooth, which also hosts the pulp. The periodontal fibres connect the tooth to the jawbone. Source: Health Scotland - Opens in new browser window. Last updated:. How can we improve this page? Email Address e. Message Maximum of characters. Send feedback. Also on NHS inform.
0コメント