MY TEETH REVISION

Scientists develop a dental implant that mimics the root of a natural tooth. What feature of the tooth root should they replicate to make the implant successful?

• The root’s ability to grind food.

• The root’s connection to the jawbone for stability.

• The root’s smooth surface to avoid damage to gums.

• The root’s ability to change shape as teeth grow.

In areas with limited access to toothbrushes, people often chew sticks from certain plants to clean their teeth. What natural property of these sticks Might have made them effective substitutes for toothbrushes?

• They contain minerals that strengthen enamel.

• The fibers in the stick scrape away plaque.

• The stick’s chemicals neutralize bacteria in the mouth.

• The stick shapes itself to fit between the teeth.

Imagine you’re designing a house with walls inspired by the structure of teeth. Which part of the tooth would be the strongest material for the outer walls?

• Pulp, because it’s soft and flexible.

• Dentin, because it provides extra layers of strength.

• Enamel, because it’s hard and protects against wear.

• Cementum, because it holds teeth in place.

If a person’s enamel gets worn out, their teeth become sensitive to hot and cold foods. What process explains this sensitivity?

• The dentin layer beneath the enamel gets exposed, allowing temperature to reach the nerves in the pulp.

• The root of the tooth starts absorbing heat and cold directly.

• Enamel protects the gums, so without it, the gums become temperature sensitive.

• Worn enamel makes teeth hollow, trapping hot or cold air inside.

A scientist discovers a fossil of an animal with only sharp, pointed teeth. What can the scientist infer about its diet?

• The animal probably ate plants, using sharp teeth to grind leaves.

• The animal likely ate meat, using pointed teeth to tear flesh.

• The animal chewed both plants and meat with its sharp teeth.

• The animal drank liquids and didn’t need teeth for eating.

While on a space mission, an astronaut faces challenges maintaining dental hygiene due to the unique environment. Which of the following explains why special care for teeth is necessary in space?

• There is no gravity to hold teeth in place.

• Space food is harder to chew, which weakens teeth.

• Brushing teeth is difficult without water in microgravity.

• Lack of sunlight in space weakens the tooth enamel.

A dentist explains that sugary drinks weaken enamel. How can saliva help protect teeth in this situation?

• Saliva washes away sugar, neutralizing the acid.

• Saliva coats teeth, preventing sugar from sticking to enamel.

• Saliva strengthens the enamel by adding minerals like calcium.

• Saliva removes bacteria by acting as a natural disinfectant.

A child eats a diet rich in calcium but doesn’t brush their teeth regularly. What might happen to his teeth over time, and why?

• His teeth will stay strong because calcium protects against all damage.

• His teeth will decay because bacteria on unbrushed teeth produce acid.

• His teeth will grow larger because calcium increases enamel growth.

• His teeth will turn yellow because calcium combines with food particles.

Imagine a robot designed to eat like a human. If the robot is given sharp front teeth (canines) but no molars, what limitation would it face in processing food?

• It would struggle to chew tough foods like meat.

• It wouldn’t be able to bite into soft fruits like bananas.

• It couldn’t grind food, making digestion harder.

• It wouldn’t be able to tear food into smaller pieces.

While observing animals, a group of students noticed that snakes have only one type of teeth, while humans have four different types. What could be the reason for this difference?

• Humans need different types of teeth to chew, tear, and grind various kinds of food.

• Humans eat more frequently, so they need more kinds of teeth for faster eating.

• Snakes don’t need teeth for chewing since they swallow their food whole.

• Snakes have stronger gums, so they don’t rely on teeth to process their food.