The first published clinical case reports linking nicotine pouches to leukoplakia — a white oral patch that can be a warning sign for oral cancer — have appeared in a peer-reviewed dental journal. Two young, otherwise healthy men developed receding gums and, in one case, a leukoplakia lesion at the exact spot where they habitually parked their pouches.

Before reading too much into that: these are case reports, the lowest rung of clinical evidence. They describe two patients, not a trend. And the leukoplakia was never biopsied, so nobody can say whether the patch was actually precancerous. What the reports do is put a documented, site-specific association on the record — and tell dentists to start asking patients about pouches.

What happened

The two cases were published in BMC Oral Health in November 2025 by Dr. Osama A. Alkhatib of the Department of Fixed Prosthetics at Damascus University. Both patients were young men who used nicotine pouches daily and parked them in the same spot in the upper jaw.

Case 1 — a 22-year-old, 11 months of daily use. He had been placing his pouch at the maxillary canine sites (the upper fang teeth). Clinical examination found isolated gingival recession — gums pulling back from the tooth — together with a leukoplakia lesion at the same site. Periodontal charting, a full mucosal inspection, and periapical radiographs were used to rule out the usual suspects: generalized periodontal disease, bite trauma, and aggressive brushing. The damage appeared confined to where the pouch sat. A biopsy was recommended. The patient declined.

Case 2 — a 25-year-old, 18 months of daily use. He had prior restorative dental work and parked his pouch mainly in the maxillary premolar-canine region. Examination with probing, radiographs, and gum-biotype assessment showed localized buccal recession — gums receding on the cheek-side surface — without any generalized periodontal involvement. No leukoplakia was reported in this case.

In both patients the pathology was site-specific: it tracked to where the pouch was held, not spread across the mouth. The author attributes that to a combination of localized chemical insult (the pouch matrix held against the mucosa) and mechanical pressure.

Why it matters

Leukoplakia is the clinical name for a white patch on the oral mucosa that cannot be wiped away. Some leukoplakias are harmless; others contain dysplasia — abnormal cells that can progress to oral cancer. The reason dentists take leukoplakia seriously is that it is the most common precancerous lesion of the mouth, and the risk is well established in smokeless tobacco users.

Nicotine pouches are marketed as tobacco-free, and the long-term cancer evidence for the pouch category is genuinely thin. Until now, that thinness meant the conversation leaned on reviews and mechanisms rather than documented cases. These two reports change the type of evidence on the table: they are the first published clinical case reports of leukoplakia associated with nicotine pouch use. That does not make pouches a proven cancer risk — two un-biopsied lesions cannot do that — but it gives clinicians a concrete, citable signal to watch.

The gum recession finding also sharpens what was already known. A separate Karolinska Institutet study of 272 young adults found gingival recession in 45% of pouch users, usually right where the pouch is parked. The Damascus reports add clinical case detail: recession that appears in an otherwise healthy mouth, at the placement site, in users as young as 22.

What "leukoplakia" does and does not mean here

This is the part that matters most, and it is worth being precise:

• No biopsy, no diagnosis of precancer. In Case 1 the patient declined the recommended biopsy. Without tissue under a microscope, the lesion can only be called a clinical leukoplakia — a white patch — not a dysplastic or malignant one. Calling these "precancerous pouch lesions" would overstate what was documented.
• Association, not causation. Case reports describe what clinicians saw and the timeline of use; they cannot prove the pouch caused the lesion. The site-specific pattern is suggestive, but two patients is not enough to establish a causal link.
• The premalignant risk is borrowed from smokeless tobacco. The author's concern about leukoplakia draws on established risk in smokeless tobacco users. Whether tobacco-free pouches carry the same risk is exactly the unanswered question — these reports raise it without resolving it.
• No brand was named. The cases do not identify which pouches the men used. Different brands use different fillers, pH adjusters, sweeteners and flavorings, and the chemical contribution cannot be separated from the mechanical pressure of holding a pouch in one spot.

What happens next

The author's clinical recommendation is that dentists routinely ask patients about nicotine pouch use, advise cessation where lesions appear, and biopsy any suspicious white patch to rule out dysplasia or malignancy. That is standard dental guidance for leukoplakia of any cause, extended to include pouches as a question to ask.

What the evidence still needs is larger studies with biopsy-confirmed lesions and longer follow-up — ideally comparing pouch users, snus users and non-users. Reviews in Frontiers in Oral Health and BDJ Team have already flagged oral cancer evidence for pouches as a research priority; these case reports are the kind of primary observation that priority is built to chase down.

For now the honest read is narrow but real: two young men, two damaged gum sites, one unexplained white patch, and a clear instruction to the dental chair — ask about the pouch.

SOURCES:

• Alkhatib OA. "Localized gingival recession and leukoplakia associated with nicotine pouch use: two clinical case reports." BMC Oral Health 25, 2004 (2025). Published 28 November 2025. Open access. DOI: 10.1186/s12903-025-07320-4. PubMed: PMID 41310598. Full text (PMC): PMC12752321
• Legert et al., on gingival recession prevalence in pouch vs snus users — see PouchDaily coverage: Nicotine pouches linked to receding gums in new study
• Nicotine pouches and oral cancer evidence review — see PouchDaily coverage: Dentists say the long-term evidence just isn't there

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