Teeth Whitening Knowledge 4

Question 1

Which food and beverage is considered one of the MOST significant contributors to extrinsic tooth staining?

Accepted Answer

Red wine

Answer

Red wine contains tannins and chromogens that adhere strongly to enamel, making it one of the top staining culprits.

Question 2

What is 'rebound' in the context of teeth whitening?

Accepted Answer

Gradual return of tooth color toward the pre-whitening shade over time

Answer

Rebound refers to the natural tendency of whitened teeth to gradually re-darken over months to years as new stains accumulate and initial hydration changes reverse.

Question 3

Which of the following is a common characteristic of enamel fluorosis that affects whitening outcomes?

Accepted Answer

It may cause white spots or mottling that become more noticeable after whitening

Answer

Whitening can intensify the contrast between fluorotic white spots and surrounding enamel, potentially making the spots look more obvious.

Question 4

At what approximate pH does hydrogen peroxide become most chemically active for bleaching purposes?

Accepted Answer

pH 9–11 (alkaline)

Answer

Hydrogen peroxide releases free radicals most effectively in an alkaline environment (pH 9–11), which is why many whitening gels are buffered to this range.

Question 5

What is the main concern with overusing whitening products beyond recommended durations?

Accepted Answer

Enamel erosion and structural weakening

Answer

Excessive or overly frequent whitening can erode enamel structure over time, leading to increased sensitivity and vulnerability to damage.

Teeth Whitening Practice Test

Teeth Whitening Practice Test

Teeth Whitening Knowledge 4