You've seen the ocean plastic documentaries. The turtles. The beaches. The heartbreaking footage of seabirds with stomachs full of bottle caps.
But here's the part that doesn't make it into the documentaries: the plastic doesn't stay out there. It comes back. And right now, it's probably in your blood.
This is the story of how that happens.
Step One: It Leaves Your Hand
Every toothbrush, every plastic bag, every coffee cup lid that gets "thrown away" has to go somewhere. In a best-case scenario, that's a landfill. But plastic is light, it travels, and our waste systems are imperfect. An estimated 8 million metric tons of plastic enters the ocean every single year — from coastlines, from rivers, from streets that drain into waterways that drain into the sea.
It doesn't take a dramatic littering moment. A plastic wrapper that escapes a bin on a windy day. Microbeads washed down a drain. Synthetic fibres from a single load of laundry. The ocean collects all of it.
Step Two: The Ocean Breaks It Down
Here's where the story gets complicated.
Plastic doesn't biodegrade. What it does instead is break apart — into smaller and smaller pieces, driven by UV light, wave action, and saltwater. A plastic toothbrush doesn't disappear. It becomes hundreds of fragments. Those fragments become thousands of particles. Those particles eventually become microplastics — pieces smaller than 5mm — and then nanoplastics, so tiny they're invisible to the naked eye.
The ocean is full of them. Researchers have found microplastics at the bottom of the Mariana Trench. In Arctic sea ice. In the most remote stretches of water on earth. There is no "away" anymore.
Step Three: It Enters the Food Chain
Microplastics in water get absorbed by plankton — the foundation of almost every marine food chain. Plankton get eaten by small fish. Small fish get eaten by bigger fish.
By the time a piece of plastic reaches a tuna, a mussel, or a prawn on your plate, it has already passed through multiple living organisms. Each one concentrates it a little more.
And then we eat the fish.
But even if you don't eat seafood, microplastics have been found in tap water, in bottled water, in table salt, in beer, in honey, and in the air we breathe. Skipping seafood doesn't close the door — it barely narrows the gap. The ocean sends it back to us in every direction it can find.
Step Four: It Enters You
This is the part that was confirmed only recently — and the findings are still coming in.
Microplastics have now been detected in human blood. A major study found them in nearly 90% of blood samples tested. They've been found in human lungs, in the liver, in the placenta of unborn babies. And in 2024, researchers at the University of New Mexico found microplastics accumulating in human brains — at concentrations that appear to be increasing year on year.
The health implications are still being studied, but a landmark 2024 paper published in The New England Journal of Medicine found that patients with microplastics in their arterial plaque had a significantly higher risk of heart attack, stroke, and death. Researchers are also investigating links to inflammation, hormonal disruption, and neurological conditions.
The plastic you threw away found its way home. Through the ocean, through the food chain, through your gut wall, and into your bloodstream.
So What Can We Actually Do?
It's tempting to spiral here. The scale is enormous, the sources are everywhere, and no individual action is going to clean the Pacific. But individual choices still matter — both for reducing your own exposure and for shifting demand away from single-use plastic culture.
1. Filter your tap water. A good filter (look for one certified for microplastics) can reduce what ends up in your glass. Ironically, bottled water is worse — the plastic leaches directly into the water.
2. Reduce plastic in your daily routine. This is where small swaps add up. Shampoo bars instead of plastic bottles. Beeswax wraps instead of cling film. And yes — a toothbrush that isn't destined for a landfill.
3. Diversifying your protein sources. Fish and shellfish are significant vectors for microplastic ingestion. This doesn't mean swearing off seafood forever, but diversifying your protein sources helps.
4. Choose natural fibres when you can. Every time you wash synthetic clothing — polyester, nylon, acrylic — thousands of plastic microfibres release into the water system, travel through wastewater treatment, and end up exactly where we've been talking about: the ocean. Natural fibres like wool, cotton, linen, and hemp don't do this. They break down biologically instead of fragmenting into particles that accumulate in marine life and, eventually, in us. You don't need to overhaul your wardrobe overnight — but next time you're choosing between a synthetic and a natural option, this is a good reason to reach for the latter.
5. Use your voice. Policy change is the lever that actually moves the needle at scale. Support plastic-reduction legislation. Buy from brands with genuinely closed-loop systems. Demand transparency.
What This Means — And What Nada Has to Do With It
The average person uses around 300 plastic toothbrushes in their lifetime. Every single one ends up in landfill or, too often, the ocean — and begins exactly the journey described above.
We'll be straight with you: Nada brush heads are made with plastic. But they don't follow that journey. When you send them back, they go directly to commercial recycling — a closed loop that keeps them out of the waste stream entirely. The handle stays with you for life. Nothing leaks into the ocean.
The solution to ocean plastic is complex. But we're committed to not being part of the problem. To date we have helped stop over 400,000 disposable toothbrushes from ending up in landfill and oceans. Nada isn’t just less waste. It’s zero waste. As in none. Zip. Nada.
Join the mission to ditch disposables and help keep our oceans plastic free.
