Which is the most appropriate claim to include in a sponsored ad running in May 2022?

1. Leave teeth three shades whiter than other brands
2. Leave teeth three shades whiter than other brands according to experts
3. Leave teeth three shades whiter than other brands. Research completed by Dental Weekly Magazine, April 21, 2019
4. Leave teeth three shades whiter than other brands. Research completed by Dental Weekly Magazine, April 2022

Correct Answer :

• Leave teeth three shades whiter than other brands. Research completed by Dental Weekly Magazine, April 2022