Background information
Why do toothbrushes have coloured bristles?
by Carolin Teufelberger
Why does toothpaste come out in stripes?
11.9.2024
Translation: Eva Francis
No matter where I squeeze or how much’s left in the tube, toothpaste always comes out in perfect stripes. How’s that possible?
Just before going to bed, I squeeze the last bit of toothpaste onto my toothbrush. To my surprise, although there’s hardly any paste left, the white, red and blue lines are perfectly shaped. How’s this possible?
There are two methods of getting the stripes into the toothpaste. Some manufacturers fill coloured paste into the tube in long stripes. You can see these stripes when you cut open the tube. However, the emptier the tube gets, the messier the stripes look as they’re squeezed out.
Want to know more about teeth? Editor Patrick Vogt interviewed senior physician Eirini Stratigaki about chalk teeth and why they’re becoming more and more common.
Header image: Stefanie Lechthaler
Painting the walls just before handing over the flat? Making your own kimchi? Soldering a broken raclette oven? There's nothing you can't do yourself. Well, perhaps sometimes, but I'll definitely give it a try.
Health
Follow topics and stay updated on your areas of interest
Background information
Interesting facts about products, behind-the-scenes looks at manufacturers and deep-dives on interesting people.
Show all
