Teeth Whitening Teeth Whitening 4

Question 1

What is the approximate pH of most professional hydrogen peroxide whitening gels?

Accepted Answer

pH 9–11 (alkaline)

Answer

Most professional whitening gels are formulated at an alkaline pH (9–11) to keep the peroxide stable and reduce enamel erosion risk.

Question 2

Which tissue is protected by a light-cured resin barrier or rubber dam during in-office whitening?

Accepted Answer

Gingiva (gums)

Answer

A gingival barrier or rubber dam is applied to protect the soft gum tissue from the high-concentration bleaching gel used during in-office procedures.

Question 3

A patient notices white spots on teeth after using whitening strips for 2 weeks. The MOST likely cause is:

Accepted Answer

Temporary dehydration of the enamel surface

Answer

White spots appearing immediately after whitening are usually caused by temporary enamel dehydration and typically resolve within a few hours as moisture returns.

Question 4

Which dietary habit would BEST help maintain whitening results long-term?

Accepted Answer

Drinking staining beverages through a straw

Answer

Using a straw keeps chromogen-rich beverages like coffee, tea, and soda from contacting the front tooth surfaces, helping to preserve whitening results.

Question 5

How does fluoride applied after whitening benefit the teeth?

Accepted Answer

It re-mineralizes enamel and reduces post-treatment sensitivity

Answer

Fluoride helps re-mineralize the slightly porous enamel surface after bleaching and reduces sensitivity by reinforcing the tooth structure.

Teeth Whitening Practice Test

Teeth Whitening Practice Test

Teeth Whitening Teeth Whitening 4