Teeth: enamel, sugar, holes, brushing and the dentist

Tests: 3 of 11 right · Exam: 0 of 4 right · Kind: ★ · Understood: 9 of 15 · Run: 2026-10-18, commit f3c23ea72

Lesson 352 of the biology course of Mova's primary school, as Mova's small model took its tests: it had read this lesson and the ones before it and learned from their exercises. Each test shows the options in the order the student saw them, its choice, the right answer, the score of every option and why it chose. The lesson itself, sentence by sentence with trees and pragmatics: the lesson in the corpora.

Every question of this lesson and each of its options parsed by Mova, with trees and pragmatics: the lesson's questions in the corpora.

Test 1 · ★ · wrong ✗

«had sweets all arvo but only little ones, that's fine for me teeth innit» What is right?

1. Yes, as long as they are not chocolate — ← Mova's choice · no support
2. No, each nibble starts a new acid attack, so all day is the worst way — ✓ the right answer · no support
3. Yes, small sweets are too little to harm teeth, however many you have — no support
4. No, but only because sweets are hard — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 2 · ★ · wrong ✗

«it says sugar free on the can, so I can sip it all day, no harm» What is the truth?

1. Only the bubbles harm teeth, not the drink — ← Mova's choice · no support
2. Sugar-free drinks clean the teeth — no support
3. It is fine if you brush after the last sip — no support
4. It is still acidic, so sipping all day keeps softening enamel — ✓ the right answer · no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 3 · ★ · wrong ✗

A boy chews a disclosing tablet and his back teeth go bright pink. What does that tell him?

1. He has been missing the back teeth when brushing — ✓ the right answer · score 0
2. His back teeth are stronger than the front — ← Mova's choice · score 3
3. His back teeth are rotten right through and must come out — score 1
4. The tablet only works on back teeth — no support

Why: It took the question to ask what it is done to. It chose option 2 with score 3, against 1 for the next best. Its support: lesson 316, line 3: «Each front tooth is hard enamel at the front and softer at the back, so gnawing wears the back faster and keeps a sharp chisel edge, like a knife that sharpens…», reached through the option's own match among the sentences about the question's things. What matched: the same doer «front tooth» (+1); the same circumstance (+1); the same light verb (be, have, do, get, go) (+1). The right option, 1, scored 0. · the question and its options parsed, with trees and pragmatics

Test 4 · ★ · wrong ✗

«brushed, then rinsed loads with water so it's proper clean» What did he get wrong?

1. He should have used hot water — no support
2. He should rinse before brushing instead — no support
3. Rinsing washes away the fluoride that should stay on the teeth — ✓ the right answer · no support
4. Nothing, rinsing lots with water is the most important part of brushing — ← Mova's choice · score 7

Why: It took the question to ask what it is done to. It chose option 4 with score 7, the only option with support. Its support: lesson 31, line 16: «Turtles bask in the sun to warm up and to make vitamin D for strong shells; pet turtles can carry salmonella germs, so wash your hands after touching one.», reached through the remembered sentence the question matched. What matched: the same action «wash» (+4); the same circumstance (+2); a different thing acted on (counts against) (+1). The right option, 3, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 5 · ★ · right ✓

What would happen if nobody cleaned plaque off a tooth for weeks?

1. It would make the tooth harder — score 7
2. It could harden into tartar that only a dentist can remove — ← Mova's choice · ✓ the right answer · score 11
3. It would turn into new enamel — score 1
4. It would fall off by itself each night — score 1

Why: It took the question to ask what happens next. It chose option 2 with score 11, against 7 for the next best. Its support: lesson 352, line 8: «Disclosing tablets colour plaque pink so you can see where you missed, and plaque left for days can harden into tartar, which only a dentist or hygienist can s…», reached through what followed the sentence the question matched. What matched: the same action «harden» (+6); the same place «tartar» (+4); the same doer «plaque» (+1). · the question and its options parsed, with trees and pragmatics

Test 6 · ★ · right ✓

«tooth doesn't hurt so there's no hole, don't need the dentist» What is right?

1. Holes start small and painless, so checkups catch them early — ← Mova's choice · ✓ the right answer · score 2
2. Holes always hurt from the first day — score -1
3. No pain always means there is no hole, so there is no need to go — no support
4. Dentists only look at teeth that hurt — score 2

Why: It took the question to ask which statement is true. It chose option 1 with score 2, tied with another option at 2 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 352, line 11: «A hole made by acid is called a cavity or decay; the dentist cleans it out and fills it, and small holes do not hurt, which is why checkups matter.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «small holes» (+1); the same property (+1). · the question and its options parsed, with trees and pragmatics

Test 7 · ★ · wrong ✗

«my nan says Washington had wooden teeth, everyone knows that» What is the truth?

1. Yes, and they lasted his whole life — ← Mova's choice · score 2
2. No, he had all his own teeth — no support
3. His false teeth were ivory, metal and real teeth, not wood — ✓ the right answer · no support
4. Yes, oak teeth carved by a carpenter — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 2, the only option with support. Its support: lesson 242, line 7: «A beaver's front teeth keep growing all its life, and their orange front has iron in the enamel, which makes them harder; a beaver can cut down a thin tree in…», reached through the option's own match among the sentences about the question's things. What matched: the same doer «front teeth» (+1); the same thing acted on «life» (+1). The right option, 3, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 8 · ★ · right ✓

In a cartoon a character bites a metal can and his teeth shatter like glass, then he grins with a gap that grows back. What is right?

1. Teeth are as weak as glass, and a lost grown-up tooth grows back in a day or two — score -1
2. A gap in a grown-up's teeth refills in a day — no support
3. Enamel is very hard but can chip, and adult teeth do not grow back — ← Mova's choice · ✓ the right answer · score 2
4. Teeth are softer than tin cans — no support

Why: It took the question to ask which statement is true. It chose option 3 with score 2, against -1 for the next best. Its support: lesson 316, line 4: «Look at a squirrel's teeth when it cracks a hazelnut: they are orange. The colour comes from iron in the enamel, which makes the tooth harder.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «enamel» (+1); the same property (+1). · the question and its options parsed, with trees and pragmatics

Test 9 · ★ · wrong ✗

«song's 2 minutes, I brush through the whole song» Is that about right?

1. No, a song is far too long — ← Mova's choice · score 2
2. Yes, about two minutes is right — ✓ the right answer · no support
3. No, you need a whole hour — no support
4. No, one second is enough — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 2, the only option with support. Its support: lesson 235, line 11: «Male humpbacks sing long songs that can last 20 minutes and be repeated for hours, and the song slowly changes over the years and spreads across oceans.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «long songs» (+1); the same property (+1). The right option, 2, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 10 · ★ · wrong ✗

Both a hot drink and an icy drink make the same tooth zing. What is the most likely reason?

1. The tooth only feels hot things — no support
2. The drinks contain acid that burns — ← Mova's choice · score 4
3. The tongue is sore, not the tooth — no support
4. Worn enamel or gum lets heat and cold reach the nerve — ✓ the right answer · no support

Why: It took the question to ask what it is done to. It chose option 2 with score 4, the only option with support. Its support: lesson 352, line 6: «Plaque is a soft film of bacteria that builds up on teeth every day; the bacteria eat sugar and make acid that eats into enamel.», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+4); the same thing acted on «acid» (+2). Against it: a different action (counts against) (-2). The right option, 4, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 11 · ★ · wrong ✗

On a desert island with no toothbrush, what would help clean your teeth best?

1. Drinking seawater — no support
2. Rubbing them hard with handfuls of wet sand — ← Mova's choice · score 1
3. Eating dried fruit all day — no support
4. Chewing the end of a twig into a brush — ✓ the right answer · no support

Why: It took the question to ask who or what does it. It chose option 2 with score 1, the only option with support. Its support: lesson 316, line 4: «Look at a squirrel's teeth when it cracks a hazelnut: they are orange. The colour comes from iron in the enamel, which makes the tooth harder.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «tooth» (+3); the same property (+1). Against it: a different action (counts against) (-3). The right option, 4, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · wrong ✗

Identify the principal origin of the acid responsible for the decay of dental enamel.

1. Cold air inhaled through the mouth — ← Mova's choice · no support
2. Saliva, which is acidic in all circumstances — no support
3. Sugar, which dissolves spontaneously into acid — no support
4. Bacteria within dental plaque, which metabolise sugar — ✓ the right answer · no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Exam question 2 · formal language · wrong ✗

Which of the following statements most accurately characterises the significance of the frequency of sugar consumption?

1. Quantity alone is of consequence, the frequency of consumption being wholly immaterial to the teeth — ← Mova's choice · no support
2. Sugar consumed at mealtimes causes the greatest harm — no support
3. Frequency is of greater consequence than quantity, each intake initiating a fresh acid attack — ✓ the right answer · no support
4. Sugar consumed in small portions is wholly harmless — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Exam question 3 · formal language · wrong ✗

Select the response consistent with the established facts concerning beverages free of sugar.

1. Such beverages are without any effect upon the teeth — ← Mova's choice · no support
2. Such beverages strengthen enamel by virtue of their carbonation — no support
3. Such beverages exert a cleansing effect upon the teeth — no support
4. Such beverages, being acidic, may nonetheless soften dental enamel — ✓ the right answer · no support

Why: Nothing it remembers matched the question, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Exam question 4 · formal language · wrong ✗

State the recommended practice subsequent to brushing with a fluoride toothpaste.

1. A sweet is to be consumed forthwith — ← Mova's choice · no support
2. The toothpaste is to be swallowed — no support
3. The residue is to be spat out without rinsing — ✓ the right answer · no support
4. The mouth is to be rinsed thoroughly with water — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/biology/352-teeth-enamel-sugar-holes-brushing-and-the-dentist/