Dental Tribune International

The history of plastic toothbrushes and how they pollute our planet

By Monique Mehler, Dental Tribune International
July 15, 2019

LEIPZIG, Germany: A couple of weeks ago, the US company 4Ocean, which specialises in removing plastic waste from the ocean, shared a post on Facebook that shows visually just how much our oral hygiene routine contributes to the world’s plastic pollution crisis. These striking photographs capture multiple buckets filled with colourful toothbrushes washed ashore on the beaches of Bali and picked up by the local clean-up crew. In the comment sections, many readers stated that they could not understand how or why so many toothbrushes ended up in the ocean in that area, or for that matter, in any other part of the world. The answer to this question is quite simple when you look at the history of plastic toothbrushes.

The plastic toothbrush as we know it today has not actually been around that long. Before its invention in 1938, tree twigs or tools made from animal parts were used to maintain a healthy mouth. In the book Dental Biotribology, the authors discuss the earliest roots of toothbrushing, which dates back to 3500 BC when chewing sticks were used in Babylonia. Chinese records of chewing sticks from 1600 BC “show that one end was chewed until it became brushlike, while the other end was pointed and used as a toothpick. […] The first bristled toothbrush also originated from China at around the same time and was brought back to Europe by traders”. In fact, chewing sticks, also called miswaks, remain an important part of Muslim culture and are still widely used today in the Middle East, Africa, rural southern US and Asia.

The miswak, a tooth cleaning twig made from the Salvadora persica tree, is an ancient form of the toothbrush as we know it today. (Photograph: ustun ibisoglu/Shutterstock)

In the meantime, the evolution of the toothbrush took a different turn in Europe and later in North America. As mentioned before, animal parts, such as handles made out of cattle bone and bristles from horse hair, were the main resources for toothbrushes. Then nylon was invented and the first nylon bristle toothbrush made with nylon yarn went on sale in 1938. Nylon bristles remained the preferred material for bristles, but manufacturers moved on to thermoplastic materials for the handles, as described in Rachel Sammons’ book Control of Dental Plaque.

The shift from natural and biodegradable materials to synthetic or semi-synthetic polymers has had a big impact on our planet in two ways. Owing to its low cost, easy production process, versatility and imperviousness to water, plastic has prevailed as a material over the last couple of decades and has actually allowed humanity to make technological advances in all areas of life. However, the environmental effects are severe, since the chemical structure of plastic makes it resistant to the natural process of degradation. Researchers are uncertain about the exact amount of plastic waste that has been produced in the last century, but a paper by American researchers titled “Production, use, and fate of all plastics ever made” states that 8,300 million metric tons(Mt) of virgin plastics had been produced by 2017 and “roughly 12,000 Mt of plastic waste will be in landfills or in the natural environment by 2050”.

Food packaging and other single-use plastic items aside, toothbrushes contribute a vast amount to this total. It can be estimated that in the US alone about one billion toothbrushes end up in the rubbish bin each year. This figure is reached if every single citizen uses plastic toothbrushes and replaces them every three to four months as the American Dental Association and many other international health organisations recommend. Considering the world’s population of 7.53 billion people, that makes roughly 29.4 billion toothbrushes each year. On average, a plastic toothbrush weighs around 20 g and so it can be calculated that the whole of humanity produces 600 million kg of plastic toothbrush waste in only 365 days. What many people do not know is that toothbrushes are not recyclable, since small parts get stuck in the machinery. That is why they end up in landfill and “because plastic is essentially indestructible, that means nearly every single toothbrush made since the 1930s is still out there in the world somewhere, living on as a piece of trash,” as the writer of an article in National Geographic put it.

Of course, this number is a worst-case scenario estimate and is not conclusive, since many people have switched to electric toothbrushes (which produce significantly less waste) or to zero-waste toothbrushes. Companies and manufacturers are slowly starting to invest in plastic alternatives derived from natural sources, such as bamboo for the toothbrush itself and starch or cellulose for packaging. Bamboo toothbrushes, for example, have moved into many bathrooms in the last couple of years, since they are now more easily obtainable in most chain pharmacies. Bamboo is the fastest-growing plant on earth and is naturally antibacterial. Therefore, it makes a great renewable material for toothbrushes.

Bamboo is the fastest-growing plant in the world, and it is considered one of the most sustainable raw materials on the planet. (Photograph: Shawn Sosa/Shutterstock)

Certainly, it can be argued that, even if every single person in the world switched to eco-friendly toothbrushes within the next week, there would still be many more areas in life that would need to be tackled to reverse the plastic pollution crisis. A report from March 2019 by the international non-governmental organization World Wide Fund for Nature suggests that, at present, not all is lost. According to its research, although “the global plastics pollution crisis will only worsen unless all actors across the plastics value chain are made more accountable for the true cost of plastics to nature and people”, what has been “created in one generation […] can be solved in one generation”.

In the past few years, regulations on single-use plastic items have been put in place. Free plastic carrier bags, for instance, are a thing of the past in most countries around the world and shops now ask for payment for them. There are many other examples that can be seen in everyday life where companies have already jumped on the zero-waste train. These include ice cream parlours that have swapped plastic spoons for wooden ones, coffee shops that give discounts if their customers bring reusable mugs and bars that offer straws made from natural materials. As The Guardian reported, “The European parliament has voted to ban single-use plastic cutlery, cotton buds, straws and stirrers as part of a sweeping law against plastic waste that despoils beaches and pollutes oceans.” This ban is expected to come into force by 2021 and will affect all EU member states. Even though this shift is forward-thinking and a change for the better, at present there is no regulation on plastic toothbrushes in place.

In the end, it can be argued that the plastic toothbrush consumption problem is not necessarily the most pressing factor that contributes to the pollution crisis. But it seems that it is a very practicable and easy place to start.

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