ExPouch

Are ZYNs bad for your teeth?

10 min read

Michael Semin
Michael Semin

Building ExPouch to help people quit nicotine pouches

Are ZYNs bad for your teeth?

ZYN pouches are mostly not bad for your teeth: they contain no tobacco leaf or sugar, and studies so far show little staining and no rise in cavities. The main risk is the gum at your pouch spot, which can recede and leave the tooth root exposed and sensitive.

Is ZYN bad for your teeth? What the evidence shows

The evidence comes from a few short studies, many of them industry-funded, and nobody has followed pouch users for decades. Most studies also don't separate brands, so this applies to nicotine pouches in general. Here is how strong the evidence is for each concern:

  • Staining and yellowing: unlikely. Based on lab tests and one clinical trial of a similar pouch, both industry-funded.
  • Tooth decay: no increase found. Based on one independent study of users with up to 6 years of use, plus short industry-funded plaque tests.
  • Sensitivity and exposed roots: possible. Based on case reports and small studies of gum recession.
  • Dry mouth: reported by some users. Nobody has studied whether it leads to cavities in pouch users.

Do ZYNs stain teeth or make them yellow?

ZYNs are unlikely to stain your teeth or turn them yellow in any way you'd notice. The ingredients that cause tobacco stains are mostly missing from white pouches, and the few tests that exist found almost no color change.

Smoking stains teeth through dark tar and through nicotine, which turns yellowish when it meets oxygen (ADA), and a 2022 systematic review of 27 studies confirmed it. ZYN has nicotine but no tar or tobacco leaf.

The nicotine in a pouch probably stains very little. That same review included one lab study (industry-funded) that soaked tooth enamel in extracts of nicotine pouches, snus and cigarette smoke. Pouches caused only slightly more color change than artificial saliva, and the difference wasn't statistically significant. Snus caused a clear color change, and cigarette smoke caused more. Still, the review's authors wrote that the role of pure nicotine in staining "is not particularly clear".

A clinical trial found the same. In a 24-week randomized trial run by Altria, which makes on! pouches, every participant had their teeth professionally cleaned at the start, and smokers who switched to on! then built up about 60% less stain than those who kept smoking.

Swedish Match, which makes ZYN, ran a trial that measured tooth color in people using ZYN Dry and ZYN Moist. The paper published in 2026 reports only gum lesions, and as of November 2026 the tooth color results haven't been published.

If your teeth have yellowed while you use pouches, coffee, tea, red wine, past smoking or age are more likely causes (ADA). Surface stains usually respond to cleaning and whitening; see whether whitening removes ZYN stains.

Do ZYNs cause tooth decay?

There's no evidence that ZYNs cause tooth decay. ZYN contains no sugar, and the studies that looked for cavities or acid in plaque didn't find an increase.

No sugar. ZYN Dry contains microcrystalline cellulose (a plant fiber filler) and maltitol, a sweetener that isn't typically linked to acid production in plaque (Alizadehgharib et al., 2026). A 2023 review for dentists concluded that because pouches use sweeteners rather than sugars, they "pose little direct risk" of cavities.

Plaque acid. Cavities start when bacteria in plaque turn sugar into acid. In the same 2026 study, a ZYN Dry pouch held for 60 minutes caused far less acid in plaque than a sugar rinse. After 56 snus users switched to ZYN for six weeks, their plaque made less acid than before, and the amount of plaque didn't change. The study was industry-funded, had no control group, and participants could still use some snus.

Cavities in real users. The only such study I found is the 2026 Swedish study, which compared 126 nicotine pouch users, 63 snus users and 83 non-users aged 18 to 30. It found no higher risk of cavities or gum disease after up to 6 years of use. This one was independent, funded by Sweden's Public Dental Service.

There are still a few reasons for caution:

  • Nicotine and bacteria. A 2024 systematic review of nicotine pouch studies points to rat experiments in which nicotine increased the growth of Streptococcus mutans, the main cavity-causing bacterium, and led to more severe decay. Whether that happens in people using pouches is unknown.
  • Plaque near the pouch. The 2023 dental review suggested plaque could build up on the teeth next to where the pouch is held, raising the risk of decay there.
  • Dry mouth. The 2024 systematic review lists dry mouth among the side effects pouch users report, though in the six-week ZYN study only one of 56 people had it. Saliva keeps harmful germs in check, so a dry mouth raises the risk of tooth decay (NIDCR).

Do ZYNs rot your teeth?

No study has found that ZYNs rot teeth. "Rotting" usually means advanced decay, and the sugar that drives it isn't in the pouch. With pouches, the more realistic risk is decay on an exposed root, covered in the next section.

ZYN teeth damage: recession, sensitivity and exposed roots

The most likely way ZYN damages a tooth is through the gum around it. Gum recession has been documented right at the pouch spot in nicotine pouch users: two 2025 case reports and a small 2026 study that found more gum attachment loss in pouch users than in non-users. The details are in whether ZYNs cause gum recession.

For the tooth, recession matters because the gum normally covers the root. When it pulls back:

  • The tooth can become sensitive. Exposed dentin lets heat, cold and acidic or sticky foods reach the nerve inside the tooth (ADA). If a front tooth next to your pouch spot stings when you drink something cold, this may be why.
  • The root decays more easily. Cementum is softer than enamel, so root surfaces are more vulnerable to cavities (ADA).
  • The tooth looks longer. The gum line over that tooth sits lower than over its neighbors.

ZYN teeth before and after: what actually changes

ZYN on its own doesn't produce dramatic before-and-after changes in your teeth. What can change over months or years is the gum at the pouch spot.

While you use pouches. The first changes show up in the gum where the pouch sits: redness, soreness, wrinkled or white patches (what ZYN gum damage looks like). With daily use in the same spot, some people develop recession there over a year or more.

If you switched from smoking. You'll pick up less new stain, but pouches won't remove old stain.

After you stop. Irritation usually heals, but receded gum doesn't grow back (more below).

Before-and-after photos online can't tell you much. You don't know what else the person smoked, drank or brushed with, and lighting changes how teeth look.

Is ZYN worse for your teeth than cigarettes, dip or snus?

No. Based on what's been studied, pouches stain less, haven't been linked to cavities and carry a lower cancer risk than tobacco products. Where they're similar is local gum damage at the pouch spot, which snus and dip also cause.

Nicotine pouches (ZYN)SnusDip and chewing tobaccoCigarettes
StainingAlmost none in lab testsClear staining in lab testsNot well studiedYes, well documented
Tooth decayNo increase found in up to 6 yearsMixed evidenceLinked to root-surface decayHigher rate of cavities
GumsLocal recession at the pouch spotRecession and more gingivitisLocal recessionTwice the risk of gum disease
Oral cancerNot shown; lower risk than tobacco, per FDANo clear link in large studiesCauses oral cancerCauses mouth and throat cancer

Based on Karanjkar et al. (2022) and Liu et al. (2025) for staining; Daneshian et al. (2026), Bankvall and Jontell (2026) and Tomar et al. (2019) for decay and gums; CDC for gum disease; NCI, CDC, FDA and La Rosa et al. (2026) for cancer. "Not well studied" means I couldn't find a recent study.

Snus is the closest comparison because it sits under the lip like a pouch. A 2026 systematic review of Swedish snus found it was linked to gum recession, gingivitis and tooth wear, while the evidence on cavities was inconsistent. When the FDA authorized 20 ZYN products, it said they pose a lower risk of cancer than cigarettes and most smokeless tobacco, but that this "does not mean these tobacco products are safe" (FDA).

How to protect your teeth if you keep using pouches

These steps lower the strain on the gum and tooth at your pouch spot. None of them has been tested as a way to prevent pouch damage; they only cut down how much exposure that spot gets.

  • Use fewer pouches and keep each one in for less time. See how many ZYNs a day is a lot and how long to keep a ZYN in. Fewer minutes under a pouch means less contact with the gum.
  • Switch sides. Alternate left and right, upper and lower lip, so no single spot takes all the pressure.
  • Don't sleep with a pouch in. That's hours of contact in one place.
  • Brush gently with fluoride toothpaste. The ADA recommends brushing twice a day with fluoride toothpaste and a soft-bristled brush, using gentle strokes. Don't scrub hard at your pouch spot, where the gum may already be irritated or pulling back.
  • Try a toothpaste for sensitive teeth if a tooth already hurts. Desensitizing toothpastes help block sensation from reaching the nerve and usually need several applications before they work (ADA). Potassium nitrate and stannous fluoride are two of the active ingredients with the best clinical results (Kaur et al., 2026). Ask your dentist which one fits you.
  • Keep up with dental visits. Tell your dentist you use pouches and where you put them, so they can check the gum and teeth there and track any change.

When to see a dentist

See a dentist if you notice any of these:

  • A tooth near your pouch spot hurts with cold, heat or sweets
  • The gum over one tooth is visibly lower than over its neighbors, or the tooth looks longer
  • A dark spot, a rough area or a notch near the gum line
  • A toothache or pain when you bite
  • A mouth that feels dry most of the time
  • A sore, ulcer or white or red patch that hasn't healed two to three weeks after you stop putting a pouch there

Tell them you use pouches, how many a day and on which side.

Frequently asked questions

Can teeth whitening remove ZYN stains?

Surface stains, including any from pouches, coffee or past smoking, usually come off with a professional cleaning, and whitening toothpastes remove surface stain with mild abrasives. Bleaching with peroxide-based whiteners can lighten deeper stain. Whitening doesn't work on crowns, veneers or fillings, and it may not fix every type of discoloration, so talk to your dentist first (ADA).

Are caffeine pouches bad for your teeth?

Nobody has studied caffeine pouches and teeth. They don't contain nicotine, but they're held against the gum the same way, so contact and pressure at the pouch spot are similar. Check the ingredients for sugar.

Do your teeth get better after quitting ZYN?

Partly. Irritation, sores and white patches around your pouch spot usually heal once the pouch is gone. Gum recession doesn't grow back on its own, so an exposed root and the sensitivity that comes with it stay, though a dentist can treat both (can your gums heal after stopping ZYN). If you're thinking about stopping, see how to quit ZYN.

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