California Registered Dental Assistant (RDA) Written Practice Exam

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What is used to hold tooth-whitening gel on the teeth?

Mouth guard
Thermoplastic tray
Dental strip
Cotton roll

The correct answer is: Thermoplastic tray

A thermoplastic tray is typically used to hold tooth-whitening gel on the teeth. A mouth guard may not fit snuggly to the teeth, allowing the gel to spread and minimize effectiveness. Dental strips may not provide full coverage on all teeth, leading to uneven whitening. A cotton roll may absorb the gel and prevent it from effectively contacting the teeth. Therefore, a thermoplastic tray is the most effective and commonly used tool for holding tooth-whitening gel on the teeth.