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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