Why Is Fluoride Good for Teeth?

What is the main difference between fluorine and fluoride in the context of dental health?

• Fluorine is a gas, while fluoride is a liquid.

• Fluorine is a dangerous element, while fluoride is a compound that strengthens teeth.

• Fluorine is found in toothpaste, while fluoride is found in water.

• Fluorine causes tooth decay, while fluoride prevents it.

How was the ability of fluoride to prevent tooth decay first noticed?

• Scientists intentionally added fluoride to water and observed the results.

• A dentist noticed that people in a certain town had stained teeth but fewer cavities.

• Through laboratory experiments on tooth enamel.

• By studying the diets of people with healthy teeth.

What was the initial observation made by dentist Frederick McKay in Colorado Springs?

• People had perfectly white teeth with no cavities.

• People had brown-stained teeth but were highly resistant to tooth decay.

• People had severe tooth decay despite good hygiene.

• People had unusually strong jawbones.

What is the primary way fluoride helps protect tooth enamel?

• It kills the bacteria that cause tooth decay.

• It creates a protective layer over the enamel.

• It combines with dissolved enamel components to form a stronger, acid-resistant material.

• It makes the teeth whiter and less prone to staining.