Jon is now getting ready to go to school. He did a good job at taking care of the dentist's office last week as a matter of fact. The dentist came back from his vacation. Jon will be learning about teeth by the way. His friends never learned about that before. Let's hope that Jon and his friends will be having a good day at school.
"Have a good day at school." said his mom.
"I sure will, mom." said Jon. "See you later."
His mom left his school and went to work.
"Hi, you two." said Jon.
"How was your day?" Diana asked.
"It was good." said Jon. "In fact, I took care of the dentist's office."
"I heard about that." said Sue. "It was nice that you take over his job."
"He was on vacation." said Jon. "We better get to class now."
"Okay." said Diana. "We don't want to be late for class."
Jon and his friends went to class and took their seats.
"We are here." said Jon. "Just in time for class."
"I can see our teacher." said Diana.
They saw their teacher entering the classroom.
"Good morning, class." said Mrs. Jean. "I hope you all have a wonderful day today."
"We sure will, ma'am." said one of her students.
"Today, we are going to learn about teeth." said Mrs. Jean.
"I did not expect that." said Jon.
"Same here." said Diana.
"A tooth is a hard, calcified structure found in the jaws (or mouths) of many vertebrates and used to break down food." said Mrs. Jean. "Some animals, particularly carnivores and omnivores, also use teeth to help with capturing or wounding prey, tearing food, for defensive purposes, to intimidate other animals often including their own, or to carry prey or their young. The roots of teeth are covered by gums. Teeth are not made of bone, but rather of multiple tissues of varying density and hardness that originate from the outermost embryonic germ layer, the ectoderm."
"Do humans have teeth, ma'am?" Jon asked.
"Of course, they do." said Mrs. Jean. "Human teeth function to mechanically break down items of food by cutting and crushing them in preparation for swallowing and digesting. As such, they are considered part of the human digestive system. They have four types of teeth: incisors, canines, premolars, and molars, which each have a specific function. The incisors cut the food, the canines tear the food and the molars and premolars crush the food. The roots of teeth are embedded in the maxilla (upper jaw) or the mandible (lower jaw) and are covered by gums. Teeth are made of multiple tissues of varying density and hardness."
"Now we remember about teeth." said Diana.
"I hope we can study it." said Jon.
"I hope so too." said Diana.
Jon and his friends have learned about teeth at school. See what happens in the next chapter of this long story.