Essential Oils for Toothache: Evidence and Safety

Bottom line: no essential oil repairs decay or treats a dental abscess. Clove oil may numb pain briefly, but the evidence is limited and concentrated oil can burn oral tissue.

This guide examines temporary symptom relief, treatment of the cause and safety as three separate questions.

Why toothache needs a diagnosis

Toothache can follow decay, a cracked tooth, a damaged filling, gum disease or infection. NHS toothache guidance advises seeing a dentist when pain lasts more than two days or does not settle with painkillers.

Fever, pain when biting, red gums, a bad taste or cheek and jaw swelling also need dental advice. A dental abscess needs urgent treatment and will not disappear without treatment.

A numbing sensation cannot show that the cause has resolved. Decay and infection may progress while the pain feels temporarily different.

What is special about clove oil?

Clove oil contains a high proportion of eugenol. PubChem describes eugenol as a major aromatic component of clove oil and documents its biological and toxicological properties.

The European Medicines Agency monograph recognises clove oil for temporary relief of toothache caused by a dental cavity. It classifies this as traditional use, based on long-standing use and plausibility rather than persuasive clinical trials.

The monograph says a dentist should be consulted as soon as possible. It also warns against contact with the gums because irritation and damage to mucous membranes can occur.

What do human studies show?

A small placebo-controlled study compared clove gel with benzocaine gel before needle insertion. Both active gels reduced reported needle pain, but this did not test toothache, infection or clove essential oil used at home.

That distinction matters. Evidence that a prepared gel reduces brief needle pain does not establish a safe dose for a cavity. It also does not show that clove oil treats the cause.

Clove oil can inhibit microorganisms in laboratory experiments. The samples, concentrations and direct exposure used in a laboratory do not reproduce the conditions inside an infected tooth or abscess.

A broad review of clove essential oil describes antimicrobial, antioxidant and other laboratory findings. It does not provide strong clinical evidence that home application treats dental disease.

Why other essential oils do not fill the gap

Cinnamon, eucalyptus, myrrh, lavender, lemon, peppermint and spearmint appear in online remedy lists. I found no convincing controlled human evidence that these oils repair decay, clear a dental abscess or resolve another common cause of toothache.

Cooling, tingling or strong flavour can alter how pain is perceived. Laboratory antimicrobial activity can generate a research question. Neither observation proves a useful dental treatment.

Safety is part of the evidence

Concentrated clove oil can damage cells. Laboratory work found marked cytotoxicity from clove oil at low concentrations, although a cell study cannot predict every effect in a person.

Oral burns are not only theoretical. A published case report described an oral chemical burn in a child after eugenol was used for tooth pain.

Swallowing the oil can be far more serious. The LiverTox review records coma, low blood sugar, clotting problems and acute liver injury after substantial clove-oil ingestion.

One report describes liver failure in a 15-month-old child after ingestion of 10 millilitres. Bottles must therefore remain securely away from children.

Six more toothache claims: prevention, procedural comfort and pain relief

Some oils have human studies during dental procedures; others have only laboratory or animal findings. Treatment of a painful tooth requires more than an antimicrobial result or a temporary change in comfort.

Cinnamon and toothache

A 2021 laboratory study found that a cinnamon-oil nanoemulsion inhibited the development of mixed oral biofilms on bovine enamel specimens. The experiment compared a formulated emulsion with other test solutions, including chlorhexidine. It did not treat a painful tooth in a person.

An earlier culture study also found that cinnamon bark oil inhibited selected decay-associated bacteria and experimental plaque. That is evidence about microbial growth under laboratory conditions, not evidence of anaesthesia or recovery from pulp inflammation.

We did not locate a controlled human trial establishing cinnamon essential oil alone for toothache. Bark oil, leaf oil, water extracts and nanoemulsions are different preparations. A laboratory concentration should not be copied onto gums or into a cavity. Reducing bacteria in a dish cannot repair a cracked tooth, drain an abscess or establish safe pain relief.

Related: Cinnamon profile.

Eucalyptus and toothache

A 2023 laboratory study tested eucalyptus oil against Streptococcus mutans and Enterococcus faecalis. The oil reduced growth-related measurements and biofilm formation compared with untreated cultures.

These organisms are relevant to dentistry, but no patients received the oil. There were no measurements of toothache, healing of an inflamed pulp, clinical infection clearance or safe oral exposure. The authors’ suggestion of a possible adjunct for prevention remains a research proposal.

We did not locate a controlled human eucalyptus-oil toothache trial. Eucalyptol in a formulated dental product should not be equated with concentrated eucalyptus oil, nor should evidence for a multi-ingredient mouthwash be assigned to one ingredient. Do not swallow the oil or apply it inside a damaged tooth while postponing dental treatment.

Related: Eucalyptus profile.

Lavender and toothache

Lavender has human dental research, but the question is usually comfort during professional treatment. A trial in 126 children reported lower anxiety and pain scores around tooth extraction with inhaled lavender than with no prior aroma intervention. Local anaesthesia and dental treatment still took place; a recognisable fragrance also makes blinding difficult.

Two trials in patients with irreversible pulpitis, involving 46 people and 78 people, reported benefits during root-canal access when aromatherapy accompanied an inferior alveolar nerve block. The larger study compared lavender, rose and no aromatherapy. It found lower pain and anxiety measures with the aromas, without a significant difference between lavender and rose. These were adjuncts to an injected anaesthetic, not alternatives to it.

A 2026 third-molar-surgery trial adds a limiting result. Only 30 participants were enrolled, despite a stated sample calculation of 90 per group. Lavender was associated with lower cortisol and anaesthetic requirements, but postoperative pain scores did not differ significantly (P=0.274). The anxiety questionnaire was administered before the intervention, so similar questionnaire scores cannot establish an effect on subsequent anxiety.

A 64-person trial of oral lavender extract drops reported lower anxiety before endodontic treatment. The full text clarifies a duplicated group label in the abstract. This was a specified oral extract and an anxiety outcome; it is not permission to swallow aromatherapy oil or evidence that an untreated tooth has recovered.

Together, these studies suggest a possible role in procedural comfort, with inconsistent outcomes and small studies. They do not establish lavender as a home treatment for the cause of toothache. Pain reduction during treatment, anxiety reduction and treatment of an abscess or inflamed pulp must remain separate claims.

Related: Lavender profile.

Lemon and toothache

A rat experiment compared lemon oil, isolated limonene, chlorhexidine and water after infection with a decay-associated bacterium. Lemon oil and limonene reduced caries-lesion measures relative to the water control. However, total cultivable microbial counts did not differ significantly among the lemon-oil, limonene and water groups; chlorhexidine had the lowest total counts.

A separate laboratory study examined a lemon-oil microemulsion and bacterial acid-related metabolism. Its experimental methods concern cultures, enzyme activity and gene expression, despite a broad conclusion about preventing dental caries.

Neither study treated human toothache. Preventing experimental lesions is also different from relieving pain once a tooth is damaged. We did not locate a controlled human lemon-essential-oil toothache trial. Lemon juice, essential oil, isolated limonene and a microemulsion are not interchangeable, and none of these reports justifies putting a homemade lemon preparation on a painful tooth.

Related: Lemon profile.

Peppermint and toothache

A 2024 randomised study compared a prepared dilute peppermint formulation with lignocaine spray before a dental injection in children. The results tables describe 52 participants, although one sentence gives 56. Reported and observed injection-pain scores favoured peppermint; heart-rate comparisons did not differ significantly.

The trial was open to patients and treating staff, so taste, scent and expectations could affect pain ratings. Both groups then received injected local anaesthetic before their dental procedure. The study specifically excluded children seeking emergency treatment for conditions such as acute pulpitis and dental abscess.

This provides preliminary evidence about needle-puncture discomfort in a supervised setting. It does not show that peppermint treats spontaneous toothache or replaces injected anaesthesia. The formulation and controlled application cannot be equated with a retail bottle or a home dilution recipe. A cooling sensation is not evidence that the underlying dental problem has resolved.

Related: Peppermint profile.

Spearmint and toothache

An experimental study of culinary-herb oils included Mentha spicata, or spearmint, in tests against decay-associated bacteria and laboratory biofilms. The oils showed varying activity; cinnamon, rather than spearmint, had the strongest bacterial inhibition in the reported comparisons.

The study measured microbial growth and biofilm mass, not pain. Exposure conditions in a dish do not establish safe contact with oral tissues or the ability to relieve an inflamed tooth nerve.

Spearmint and peppermint are different oils. The peppermint injection study discussed above cannot be treated as a spearmint trial, and a mint flavour in toothpaste is not evidence of an analgesic effect. We did not locate a controlled human spearmint-essential-oil toothache trial. Dental treatment is still needed to address the cause of persistent pain.

Related: Spearmint profile.

Keep temporary relief separate from treatment

NHS toothache guidance advises seeing a dentist for pain lasting more than two days, pain not relieved by painkillers, or symptoms such as fever, biting pain, a bad taste or cheek swelling. Swelling around the eye or neck, or swelling that impairs breathing, swallowing or speaking, needs emergency assessment. A pharmacist can advise on suitable temporary pain relief while dental care is arranged. Do not swallow essential oils or put concentrated oil into a cavity.

Search limitations: Targeted Europe PMC and web searches used common and botanical names with earache, otitis, ototoxicity, toothache, pulpitis, dental pain and dental caries, followed by citation checks, completed 16 September 2026. This is an editorial review, not a systematic review or exhaustive unpublished-trial search. The peppermint injection trial, 2024 lavender pulpitis trial, 2025 oral lavender extract trial and 2026 lavender surgery report were checked in full. Other studies were appraised from indexed abstracts, limiting assessment of methods and adverse effects. Failure to locate a trial does not establish that none exists.

References for these comparisons

What to do while arranging care

Follow NHS advice for short-term toothache care or ask a pharmacist or dentist about a product designed for oral use. Do not place an unlabelled aromatherapy blend into a cavity.

The World Health Organization identifies untreated tooth decay and severe gum disease as major oral-health problems. Neither is corrected by masking pain.

When it is urgent

Seek emergency help if swelling around the eye or neck is present. Do the same if swelling in the mouth or neck makes breathing, swallowing or speaking difficult.

The American Dental Association explains that an abscess can spread beyond the jaw. Urgent assessment matters even when pain has temporarily eased.

My verdict

Clove oil has a narrow traditional role in temporary toothache relief. One small gel study supports a local numbing effect, but it does not prove that home-applied essential oil is safe or effective.

I would not use other essential oils for toothache. I would never allow temporary numbness to postpone dental care.

References

Editorial responsibility and correction note

Editor: John Hamlen. This article has not been independently reviewed by a clinician.

Reference correction, 12 September 2026: Changes in this check: Correct authors against PubMed metadata. This was a targeted correction, not a comprehensive new review of every claim in this article.

Read our editorial policy, evidence method and corrections policy, including how to report an error.

Keep temporary relief separate from dental treatment

Evidence update: 13 September 2026.

Controlled clove research supports a possible surface-numbing effect, but does not establish relief of untreated toothache over a useful period. A suspected dental abscess needs urgent dental care. Seek emergency help for breathing or swallowing difficulty, eye involvement or extensive swelling.

Related evidence review: Clove Oil for Toothache: What the Dental Trials Really Show.

Related evidence review: Lavender Oil for Dental Anxiety: What Human Trials Show.

Related evidence review: Myrrh Oil for Toothache: What Mouthwash Trials Really Show.

Essential Oils for Toothache: What the Evidence and Safety Advice Say