HAVE you ever noticed the coloured square on the bottom of a toothpaste tube?

The theory is that: The tiny symbol, on the sealed end of the tube, comes in green, blue, red or black. Green: If the code is green then it means that the toothpaste contains only natural ingredients. Blue: Blue color means the toothpaste’s composition is natural in combination with medicines. Red: If the code is red then the toothpaste contains natural substances and chemicals. Black: If on the bottom of the tube is found black code it means that the paste contains only chemicals.