Rumour has it that the tiny, coloured square stamped onto the bottom of your toothpaste tube can tell you about the chemical make-up of your minty-fresh mouth product.

There are four colour options: Green means the toothpaste is completely natural; blue indicates a natural composition with some added medicines; red is a mix of natural and chemical; and black is an all-chemical make-up.

But the whole “secret colour-code” theory has since been proven to be a complete fabrication.

So what does it mean?

Turns out the mysterious little squares actually do have a secret purpose – and it all has to do with technology.

The tiny boxes are called “eye marks”, and are read by light beam sensors during the manufacturing process; all they’re there for is to tell the high-speed machinery where to cut and fold the tube.

Anyone else feel a little let down?

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