Given this backdrop, understanding how to achieve the effectiveness of health ads is of importance. To vividly show product efficacy, marketers attempt to exhibit the change that products bring. A change ad, which is widely used in the marketplace, is defined as an ad that shows the corresponding changes delivered by a health product (or service). A change ad can be classified as either a progression ad or a before/after ad (Cian et al., 2020). For instance, when highlighting the changes that occur after orthodontic treatment, a progression ad will present the state of the teeth that range from irregular (before) to slightly aligned (intermediate) and finally to perfectly aligned (after), while a before/ after ad will only compare irregularly aligned teeth (before) with perfectly aligned teeth (after). Other health persuasions (e.g., weight-loss programs, acne treatments, hair-growth treatments, and teeth-whitening products) could be also promoted through change ads to emphasize product efficacy.Recent research has documented that compared with before/after ads, progression ads are more likely to encourage consumers to engage in process simulation spontaneously and therefore make the ads more credible and persuasive (Cian et al., 2020). However, a particular type Siyun Chen and Sining Kou share the co-first authorship.