Question: Which is the most appropriate claim to include in a sponsored ad running in May 2022?
- Leave teeth three shades whiter than other brands
- Leave teeth three shades whiter than other brands according to experts
- Leave teeth three shades whiter than other brands. Research completed by Dental Weekly Magazine, April 21, 2019
- Leave teeth three shades whiter than other brands. Research completed by Dental Weekly Magazine, April 2022
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