The colored squares or stripes often found at the bottom of toothpaste tubes have been the subject of much speculation. These marks, sometimes called “eye marks,” are not related to ingredients or intended for consumers. Instead, they are part of the manufacturing process, guiding sensors on the assembly line to properly cut and fold the packaging. This ensures consistency and efficiency during production.
Accurate and efficient packaging is crucial for any product, particularly in high-volume manufacturing. These marks facilitate a streamlined automated process, minimizing errors and waste. This system ultimately benefits consumers by keeping production costs down and ensuring each tube is sealed correctly, preserving the product’s integrity. While various theories about these markings persist among consumers, their true function is purely technical.
