Summary
The creator contrasts the results of using American toothpaste for 18 years, showing yellow teeth, with using Japanese toothpaste for 4 weeks, showing white teeth. The video then reveals the specific Japanese toothpaste they use daily, Mouthology.
Product placement
Mouthology toothpaste: ACTS - it is used to brush teeth, and the video implies it whitens them. Removing it would change the video's outcome. Mouthology: APPEARS - it is the brand name on the product. Removing it would not change what happens in the video.