Back to: HOME ECONOMICS JSS1
Welcome to class!
In today’s class, we will be talking about the teeth. Enjoy the class!
The Teeth
The teeth are the hardest substances in the human body. Besides being essential for chewing, it plays an important role in speech. Parts of the teeth include Pulp: The softer, living inner structure of teeth. Blood vessels and nerves run through the pulp of the teeth.
The four main types of teeth
-
Incisors:
Your incisors are eight teeth in the front centre of your mouth (four on both bottom and top). These are typically the first adult teeth that a child will get, coming in when the child is between six and eight years old. Incisors are the teeth that you use to bite into your food.
-
Canines:
Your canines are the next teeth that develop in your mouth. You have four of them and they are your sharpest teeth, used for tearing apart food.
-
Premolars:
Premolars are used for tearing and crushing food. Unlike your incisors and canines, premolars have a flat biting surface. You have eight premolars in total.
-
Molars:
Your molars are your largest teeth. Their function is similar to that of the premolars, to grind, tear, and crush food. Molars have a large flat biting surface which makes them perfect for this job.
Your teeth are one of the strongest parts of your body. They’re made from proteins such as collagen, and minerals such as calcium. In addition to helping you chew through even the toughest foods; they also help you speak clearly.
Most adults have 32 teeth, called permanent or secondary teeth:
- 8 incisors
- 4 canines, also called cuspids
- 8 premolars, also called bicuspids
- 12 molars, including 4 wisdom teeth
Children have just 20 teeth, called primary, temporary, or milk teeth. They include the same 10 teeth in the upper and lower jaw:
- 4 incisors
- 2 canines
- 4 molars
Primary teeth start to erupt through the gums when a baby is about 6 months old. The lower incisors are usually the first primary teeth to come in. Most kids have all 20 of their primary teeth by age 3.
Children tend to lose their primary teeth between the ages of 6 and 12. They’re then replaced by permanent teeth. Molars are usually the first permanent teeth to come in. Most people have all of their permanent teeth in place by age 21.
In our next class, we will be talking about the Hand and Feet. We hope you enjoyed the class.
Should you have any further question, feel free to ask in the comment section below and trust us to respond as soon as possible.
For more class notes, homework help, exam practice, download our App HEREJoin ClassNotes.ng Telegram Community for exclusive content and support HERE