Why does mouthwash appear blue or green?

Mouthwash often appears blue or green due to the inclusion of color additives, such as dyes, which enhance its visual appeal and convey a sense of freshness. These colors are typically derived from synthetic or natural sources and are used to make the product more recognizable and attractive to consumers. Additionally, the color can be associated with qualities like cleanliness and efficacy, reinforcing the product's intended use.