White Trays vs. Whitestrips: Which Whitens Teeth Better?

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Author: Sofia PC

Grade Level: 6th - 9th;  Type: Consumer Science/ Chemistry


In this experiment, we will be comparing the effectiveness of two different and popular types of teeth-whitening products: Crest Whitestrips and Aquafresh Whitetrays.

Research Questions:

Teeth are structures in the mouth that are individually squares or cubical-shaped with grooves intended for use in breaking down food for consumption. Teeth are naturally white or off-white in color, but over time foods and drinks such as coffee and tea can stain teeth.

Teeth-whitening products are created for the purpose of returning teeth back to their original, whiter state. Before they were available commercially, people had to visit dentists' offices and get charged upwards of $200 for a teeth whitening session. Companies claim that at-home whitening kits are an effective and much more economical alternative. But do they work?


  • Crest Whitestrips Premium-7day (enough boxes of these for your chosen number of test subjects)
  • Aquafresh White Trays (enough boxes of these for your chosen number of test subjects)
  • Test subjects who need noticeable teeth whitening
  • A camera
  • Pen/paper for notes

Experimental Procedure:

  1. Separate your test subjects into two groups: one to use the white trays and the other to use white strips.
  2. Take photos to use as the “before” to compare the results with later.
  3. Instruct your test subjects to use the whitetrays and whitestrips as directed for ine week.
  4. After one week, take a photo of the teeth again and see if there is a major difference.
  5. Evaluate which one worked better overall.

Terms/Concepts:· Teeth; Enamel; Teeth-Whitening


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