Short answer: clove essential oil is usually distilled from the flower buds of Syzygium aromaticum and is commonly rich in eugenol. It has credible laboratory activity and a history of dental use, but neat household oil is not a safe substitute for dental care or a licensed dental product.
Clove bud, leaf or stem?
Culinary cloves are dried flower buds. Commercial essential oil may be distilled from buds, leaves or stems, and those products can differ in composition and intended use. The label should state Syzygium aromaticum, the plant part and the extraction method. Kew’s Plants of the World Online provides the botanical record for the species.
Eugenol is generally the principal constituent, but its proportion and the accompanying compounds vary. A scientific review describes eugenol’s chemistry, experimental activity and toxicological considerations. Evidence about isolated eugenol, however, is not automatically evidence about every clove-oil bottle.
What is the recognised dental use?
The European Medicines Agency assessment report reviews traditional medicinal use of clove oil, including temporary relief of toothache. Its accompanying monograph describes a narrowly defined traditional use, not proof that home application treats the cause of dental pain.
Toothache may come from decay, a cracked tooth, gum disease or infection. Oil cannot repair those problems. Pain that persists, swelling, fever, difficulty swallowing or difficulty breathing needs prompt dental or medical assessment. Applying neat oil can injure oral tissue and may delay effective care.
Laboratory evidence
Laboratory research has reported antibacterial activity for clove oil and eugenol. Cell studies have also found cytotoxic effects at some concentrations. Both findings are relevant: a chemical concentration that damages microbes or cultured cells is not automatically suitable for living tissue.
Laboratory studies can support further formulation research, but they do not show that swallowing clove oil treats infection, that a diffuser disinfects air or that neat application cures a fungal problem. Clinical effectiveness requires controlled human evidence for the exact product, route and outcome.
Dental materials containing eugenol are prepared for a particular clinical purpose and placed in controlled amounts. Their use by a dentist does not validate repeated home soaking of a painful gum or tooth. The vehicle, concentration, contact time and health of the surrounding tissue all affect the result.
Risks of concentrated clove oil
Eugenol can irritate and sensitise skin and mucous membranes. Accidental swallowing can cause significant toxicity, particularly in children. Culinary use of a few whole cloves does not establish the safety of a bottle of concentrated volatile oil.
A clinical review describes allergic contact dermatitis caused by essential oils and fragrance constituents. Oxidation and repeated exposure can influence risk. A brief home patch test cannot guarantee future tolerance.
- Do not swallow clove oil or add it to food, drinks or capsules.
- Do not apply neat oil to a tooth, gum, mouth ulcer or broken skin.
- Use only a dental product made for oral use, within its instructions.
- Keep the bottle locked away from children and pets.
- Avoid large-area skin use and contact with eyes or mucous membranes.
- Seek advice if you use anticoagulant or antiplatelet medicines, or have a bleeding disorder.
If oil is swallowed, contact a poisons service or emergency medical service promptly. Do not induce vomiting. Take the labelled container to the telephone or appointment if it is safe to do so.
After oral exposure, continuing pain, white or ulcerated tissue, swelling or difficulty swallowing needs assessment. Tooth pain that wakes someone, persists or returns also deserves dental care even if a temporary product reduces the sensation.
Buying checklist
- The Latin name and plant part are explicit.
- A current batch analysis quantifies eugenol and other major constituents.
- Oral directions appear only on a product specifically formulated and authorised for that route.
- The seller does not equate laboratory antimicrobial activity with curing infection.
- Warnings cover children, ingestion, skin and mucous-membrane exposure.
My assessment
Clove oil has a better documented traditional dental context than many essential oils, but that narrow history is routinely stretched into broader claims. It does not remove the need to diagnose toothache, and neat application is capable of harm. Treat it as a potent eugenol-rich ingredient, not as a household cure.
Clove oil and snoring
Clove bud appeared in a four-oil trial that measured post-COVID-19 fatigue. The mixture cannot identify a clove effect, and fatigue is not a snoring outcome.
Read the clove comparison in our snoring guide for the formulation and outcome limits.
Targeted evidence update: 14 September 2026. This section does not represent a new review of every claim on this profile.
Reference: Hawkins J et al. Complementary Therapies in Medicine. 2022;67:102823.
Clove and yeast infection
Clove research includes animal infection models and an experimental blended gel. Neither establishes a safe vaginal treatment in people. See the detailed evidence comparison for the studies, limitations and appropriate care.
Clove and urinary tract infection
Clove studies use different products. Extract–antibiotic antagonism in one assay cautions against assuming that combinations are always helpful. See the detailed UTI evidence comparison for the research, limitations and appropriate care.
Clove and fungal nails
Clove laboratory activity can diminish over time; combination and Candida findings do not establish treatment of infected nails in people. See the detailed evidence comparison for the studies, limitations and appropriate care.
Clove and plantar heel pain
Clove-derived eugenol appeared in a mixed plantar-pain product, but clove was not isolated; a separate aroma headache trial found no significant between-group benefit. See the detailed plantar-fasciitis comparison for the studies, limitations and care context.
Clove and sinus symptoms
Clove oil reduced nasal-cell viability in a laboratory study. Antifungal drug-delivery research does not establish a safe clove-only sinus remedy. See the detailed sinusitis comparison for the preparations, findings and limitations.
Clove and Lyme disease
Clove bud oil prevented culture regrowth at one tested concentration, but bacteria regrew at a lower concentration. This is laboratory evidence, with no controlled human Lyme-treatment trial located. See the detailed evidence comparison for the studies, limitations and care context.
References
- Kew Plants of the World Online search for Syzygium aromaticum
- European Medicines Agency assessment report on clove and clove oil
- European Medicines Agency monograph on clove oil
- Scientific review of eugenol
- Laboratory antibacterial research on clove oil and eugenol
- Laboratory cytotoxicity research involving clove oil
- Clinical review of essential-oil contact allergy
Related evidence review: Essential Oils for Earache: Evidence and Why Ear Drops Need Care.
Dental needle studies and toothache are different
Evidence update: 13 September 2026.
The adult clove-gel trial measured pain from needle sticks through the mouth lining. A newer paediatric comparison also concerned topical application before local anaesthetic. Neither establishes treatment of tooth decay or an abscess. A professional eugenol-containing material and a bottle of clove oil are not interchangeable.
Related evidence review: Clove Oil for Toothache: What the Dental Trials Really Show.