3 Striped toothpaste

Some toothpastes have the fluoride or mouthwash incorporated as a stripe.

The standard cleaning mixture is usually chalky white, while the fluoride or mouthwash is often a clear blue or red gel. The two pastes are mixed separately. As with all toothpastes, the empty tubes, called blanks, are filled from the wide end, which is then crimped and sealed. The two pastes contain colours that will not mix, so the pastes do not flow into one another. When the toothpaste is squeezed out of its tube, white and coloured stripes emerge.

The coloured stripes contain fluoride or mouthwash.

Putting in stripes

There are two methods of getting the stripes in toothpaste. In the tall container, the white and coloured pastes are put into the tube separately, and combine when they are squeezed out. In the traditional tube, the coloured paste is in a ring near the tip and goes through holes to give stripes to

Filling the tubes Empty toothpaste tubes, called blanks, go through a machine for filling. A measured amount of toothpaste is packed in, then the ends are sealed.

Coloured toothpaste is squeezed through holes to make stripes.