I spent most of my life chewing regular gum.

I loved gum. I still love chewing.

So when I first started learning what “gum base” actually meant, I had one very simple question:

Because if you start searching that question, the internet gets dramatic very quickly.

Some people say you're chewing plastic. Others say that's complete nonsense.

The actual answer needs a little more explanation — but learning what can be in modern gum base was enough to change what I personally wanted to chew.

So... Is Chewing Gum Actually Plastic?

Many modern chewing gums use a formulated gum base, and synthetic polymers can be part of that base. Depending on the formulation, gum-base materials can include substances such as polyvinyl acetate and other polymeric ingredients used to create the stretch, softness and chew people expect.

The U.S. FDA specifically lists polyvinyl acetate among substances permitted for use in chewing-gum base, along with a number of other natural and synthetic materials.

So the synthetic-polymer connection isn't an internet myth.

At the same time, a finished piece of chewing gum isn't literally a chopped-up grocery bag. “Plastic” is a very broad word, and gum base is a formulated material designed for chewing.

But for me, learning that distinction didn't make the question disappear.

It actually made me more interested in what I had been putting in my mouth all those years.

I say that as somebody who chewed regular gum for most of my life.

I'm not standing on the other side pretending I never touched the stuff. I ate it too. A lot of it.

I just know more about gum base now than I did then — and now I have another option.

Why Doesn't Regular Gum Dissolve?

Think about what happens when you chew a fresh piece of conventional gum.

At first there's sweetness and flavour. As you chew, many soluble ingredients dissolve into your saliva and the flavour eventually fades.

But the chewy material remains.

That's what the gum base is there to do.

It gives the gum its persistent structure so it can be chewed without simply dissolving like a candy.

We go deeper into the ingredients and purpose of gum base in our guide to what gum base actually is.

Why Does the Gum Industry Use Synthetic Materials?

I understand why.

They're useful.

Large-scale gum manufacturing needs consistency. Companies need enormous batches to behave predictably. Customers expect the same texture every time they open the same package.

Synthetic and manufactured gum-base materials help companies achieve that consistency and scale.

After working with actual tree resin, I understand the attraction.

Natural resin does not care about your production schedule.

One batch can be hard. Another can be soft. Temperature changes it. Individual pieces vary. Anyone working directly with resin eventually learns that the material gets a vote.

Then Came the Microplastics Research

In 2025, researchers from UCLA presented a pilot study at the American Chemical Society's Spring meeting looking at microplastics released into saliva while people chewed commercially available gum.

They tested five brands of synthetic gum and five brands marketed as natural.

The researchers reported that both categories released microplastics into saliva. They also detected some of the same synthetic polymer types in gums from both groups.

That surprised me.

I expected the synthetic gums to be the interesting part of the study.

Instead, both groups were.

The researchers said they were still investigating why synthetic polymers appeared in the natural gums they tested.

They also emphasized that the health effects of microplastics on humans are not yet established.

That uncertainty matters. This pilot study does not prove that chewing conventional gum causes a particular disease, and it doesn't tell us exactly what years of exposure from chewing gum might mean for a person.

But here's where my personal view comes in:

I don't need someone to prove that conventional gum is going to hurt me before I'm allowed to decide I don't want that kind of gum base in something I may chew for hours.

That's a personal choice, not a medical claim.

And now that I have an alternative made from resin Ron and I harvest ourselves, I personally have zero desire to go back.

“Natural” on the Package Isn't Enough for Me Either

The microplastics study also reinforced something else I think matters.

The word natural by itself doesn't tell you what a chewing gum actually contains.

Commercial products marketed as natural can use different bases and different formulations. The UCLA researchers found microplastics in the commercially marketed natural gums they tested too.

So I don't think the useful divide is simply:

Natural label = good. Conventional label = bad.

I want to know what the actual chewing material is.

What is the base?

Where did it come from?

What am I going to have sitting in my mouth while I chew?

Where Our Spruce Gum Is Different

This is the part that's incredibly simple for us to answer.

We don't buy a proprietary commercial gum-base mixture.

The tree resin itself is the chewing material.

Ron and I harvest the resin ourselves.

We bring it home. We sort it. We work with it. We know what went into the gum because we handled the material before it ever became gum.

There isn't a mystery base arriving here that we then turn into “natural gum.”

We start with resin.

Humans Managed to Chew Gum Before Synthetic Gum Base Existed

This is another reason the subject fascinates me.

Chewing gum did not begin with synthetic polymers.

People around the world chewed natural materials long before modern gum factories existed — spruce resin in northern North America, chicle in Mesoamerica, mastic around the Mediterranean and other plant materials elsewhere.

We've explored that much older story in our guide to natural chewing gum around the world.

Synthetic gum base belongs to the modern industrial chapter of chewing gum.

It helped manufacturers make enormous quantities of consistent gum.

But it isn't necessary for the basic human act of chewing gum.

We were doing that long before it existed.

I Loved Regular Gum. I Just Don't Want It Anymore.

This is probably the simplest way I can explain my position.

I didn't become interested in spruce gum because I hated chewing gum.

I became interested in it because I love chewing gum.

It keeps my mouth busy. When I'm sitting at the computer completely hyper-focused on something, there's a very good chance I'm chewing spruce gum.

But conventional gum feels completely different to me now.

It's soft, squishy and weirdly smooth. I've joked before that after getting used to spruce gum, regular gum feels like chewing a slug.

And once I also started paying attention to what modern gum base can contain, there wasn't much pulling me back.

Given the choice between a manufactured gum base containing synthetic polymers and resin Ron and I harvested from Canadian trees, I know which one I want in my mouth.

So Should You Be Worried About Chewing Gum?

I think people deserve something better than either panic or dismissal.

There are legitimate questions here.

Synthetic polymers are used in modern gum-base technology. Researchers have now demonstrated microplastic release into saliva from the commercial gums they tested. The health implications of that exposure are still being studied.

Those facts don't require us to invent consequences that research hasn't demonstrated.

They also don't require me to shrug and say none of it matters.

For me, knowing what I know is enough to make a choice.

I would rather chew tree resin.

Someone else can look at the same information and make a different choice.

But at least now we're asking the right question:

Once you start there, the conversation about chewing gum gets a lot more interesting.