Teeth Whitening Whitening Ingredients & Chemistry 3

Question 1

What is the main reason whitening gels require a slightly acidic or neutral pH rather than a highly alkaline pH?

Accepted Answer

Peroxide is most reactive and stable near neutral pH

Answer

Alkaline conditions prevent enamel from absorbing oxygen

Answer

High pH causes gum burns immediately

Answer

Alkaline gels cannot be loaded into trays

Question 2

Dental fluorosis stains result from excess fluoride during which developmental stage?

Accepted Answer

During enamel formation in childhood

Answer

After tooth eruption in adulthood

Answer

During root calcification in adolescence

Answer

During the eruption of primary teeth

Question 3

Which of the following is NOT a chromogen (stain-causing compound) typically found in beverages?

Accepted Answer

Sodium chloride

Answer

Anthocyanins

Answer

Tannins

Answer

Polyphenols

Question 4

How does the oxygen released by hydrogen peroxide whiten teeth at the molecular level?

Accepted Answer

Oxidizes conjugated double bonds in chromogen molecules, altering light absorption

Answer

Dissolves enamel to expose whiter dentin

Answer

Physically lifts stain particles via bubbling

Answer

Bleaches nerve tissue inside the pulp

Question 5

What is a 'shade guide' used for in clinical teeth whitening?

Accepted Answer

Objectively measuring and documenting tooth color before and after treatment

Answer

Determining the correct tray thickness

Answer

Mixing the peroxide gel to the right concentration

Answer

Selecting the correct LED lamp wavelength

Question 6

Rembrandt and Colgate Optic White are examples of which category of whitening product?

Accepted Answer

Over-the-counter whitening toothpastes

Answer

Prescription-strength bleaching gels

Answer

In-office power bleaching systems

Answer

Custom tray take-home kits