Distinctive notches along the biting edges of front teeth were the clearest pattern in reports involving people who crack unshelled sunflower seeds with their teeth. The review calls this tooth surface loss and describes incisal notching, or notches along the biting edges of the front teeth, as the most consistently reported finding.
That finding is an association in the published evidence, not proof that the practice causes dental damage. The authors said the available studies were insufficient to establish a cause-and-effect relationship or treat unshelled sunflower seed consumption as an established risk factor.
One cross-sectional study entry reported incisal notching in 2 of 21 patients with tooth surface loss, or 9.52%. The figure came from a single study entry and does not estimate the risk among all people who consume unshelled sunflower seeds.
Other reports described deeper dentin lesions, dentinal hypersensitivity, incisal fractures, enamel craze lines and tooth discoloration. They also mentioned periodontal findings, localized inflammatory disease around implants when a shell was impacted, and jaw-joint symptoms or tenderness in the muscles used for chewing.
A small and mixed evidence base
The study was a scoping review, designed to map which dental findings had been reported among people with a history of unshelled sunflower seed consumption and to identify gaps in the evidence. It was not designed to establish causality, estimate risk or provide evidence-based clinical recommendations.
The eligibility criteria covered English-language human studies reporting clinical findings associated with unshelled sunflower seed consumption. The included designs could be case reports, case series, cross-sectional or longitudinal observational studies, and narrative reviews containing original data through 21 August 2026. The exposure involved placing an intact shell between the front teeth and cracking it by biting to separate the shell from the kernel.
Researchers found 651 records. After removing 239 duplicates, they screened 412 titles and abstracts before including eight articles. The searches were conducted independently by two authors across the named bibliographic databases and Google Scholar, with grey-literature searching through Publish or Perish.
The eight articles comprised two cross-sectional studies, three case reports, two case series and one narrative review containing a previously unpublished case. Two reviewers independently extracted the data using a structured form.
Because the evidence came in several different forms, the findings were summarized descriptively and narratively. The review did not perform a formal critical appraisal of the studies.
A signal, not a risk estimate
The review was not prospectively registered and had no externally registered protocol. Its authors presented the work as an evidence map rather than a test of whether sunflower seed shelling directly produces tooth surface loss.
The authors concluded that unshelled sunflower seed consumption may be a contributing exposure, but the evidence is not strong enough to establish it as a risk factor. The reported dental, periodontal, implant-related and jaw-joint observations therefore remain findings described in a limited, nonrandomized evidence base.
No studies specifically evaluated the management of tooth surface loss associated with unshelled sunflower seeds. As a result, the effectiveness of proposed management or preventive approaches remains uncertain.
The review leaves the central questions open: how common these reported findings are, which consumers may be at risk and whether proposed approaches can prevent or manage the damage.
Paper data and sources
Original title: Tooth surface loss associated with unshelled sunflower seed consumption: a scoping review
Authors: Veerabhadrappa S, Ramachandra S, Yadav S et al.
Journal/Repository: Frontiers in oral health
Status: Peer-reviewed
First online: 2026-10-10
DOI: Not available
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