California Registered Dental Assistant (RDA) Written Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare effectively for the California Registered Dental Assistant (RDA) Written Exam. Utilize our comprehensive quizzes and resources, featuring multiple-choice questions that enhance your understanding and readiness for the exam!

Practice this question and more.

_____ is an ingredient of tooth whitening strips.

Hydrogen peroxide
Fluoride
Carbamide peroxide
Chlorhexidine

The correct answer is: Carbamide peroxide

Carbamide peroxide, not hydrogen peroxide, is typically used as the active ingredient in most tooth whitening strips. Hydrogen peroxide is not strong enough to penetrate the tooth enamel and break down stains, whereas carbamide peroxide is more effective at doing so. Even though both hydrogen peroxide and carbamide peroxide are bleaching agents, hydrogen peroxide can cause more tooth sensitivity and irritation if not used properly. Fluoride is commonly found in toothpaste and mouthwash for cavity prevention, not tooth whitening. Chlorhexidine is an antiseptic used to treat infections and is not typically used in tooth whitening products.