Clove bud oil is an essential oil extracted from the dried flower buds of the clove tree, a tropical plant grown primarily in Indonesia, Madagascar, and other warm climates. The oil is rich in eugenol, a compound that gives cloves their characteristic warm, spicy scent and accounts for most of the oil’s pain-relieving and antimicrobial properties. It has been used as a remedy for toothache since at least the 13th century and remains one of the most widely recognized essential oils in both traditional medicine and modern dentistry.
How Clove Bud Oil Is Made
The oil comes from the unopened flower buds of the clove tree. Producers harvest the buds just before they bloom, dry them, and then extract the oil through steam distillation. In this process, steam passes upward through the plant material, carrying the volatile compounds with it. Because the oil doesn’t mix with water, it separates naturally once the steam cools and condenses, making it easy to collect.
What’s in It
Eugenol is the dominant compound, typically making up the majority of the oil’s composition. Clove bud oil also contains eugenol acetate, a related compound not found in clove leaf oil, along with beta-caryophyllene and alpha-humulene. These secondary compounds contribute to the oil’s overall scent profile and biological activity, but eugenol does most of the heavy lifting when it comes to the oil’s therapeutic effects.
Clove Bud Oil vs. Clove Leaf Oil
Not all clove oil comes from the same part of the plant, and the differences matter. Clove bud oil contains a higher percentage of eugenol plus eugenol acetate, which is completely absent in leaf oil. Clove leaf oil tends to have a sharper, less refined scent. Interestingly, research on antifungal activity has found that clove leaf oil nanoemulsions can outperform bud oil at lower concentrations against certain fungi, suggesting each type has distinct strengths. For aromatherapy and topical pain relief, bud oil is generally preferred because of its more balanced chemical profile and milder character on skin.
How It Relieves Pain
Eugenol works in a way that’s remarkably similar to lidocaine, the local anesthetic your dentist uses. It blocks voltage-gated sodium channels in pain-sensing nerve cells, which prevents those nerves from firing electrical signals. Without those signals reaching your brain, you don’t feel the pain. Research on the trigeminal nerve system (the nerve responsible for sensation in your face and teeth) confirmed that eugenol reversibly shuts down the electrical activity in multiple types of pain-sensing neurons. This is why dabbing a small amount of diluted clove bud oil on a sore tooth can produce genuine, if temporary, numbing.
The use of clove for dental pain dates back to at least the 1200s. Today, clinical researchers are still comparing clove-based gels against standard topical anesthetics like benzocaine for use in pediatric dental procedures, a testament to how seriously the compound is taken even in modern clinical settings.
Antimicrobial Activity
Clove bud oil is effective against a range of bacteria and fungi. Lab studies show it inhibits Staphylococcus aureus, a common cause of skin infections, at a minimum inhibitory concentration of 0.625 mg/mL. It also shows activity against Listeria monocytogenes (a foodborne pathogen) and E. coli. This broad antimicrobial spectrum is one reason clove oil has a long history as a food preservative, and why the FDA recognizes clove bud oil as a flavoring agent with Generally Recognized as Safe (GRAS) status for use in food.
Common Uses
Most people encounter clove bud oil in one of a few contexts:
- Dental care: Applied topically (always diluted) to soothe toothaches, gum pain, or irritation from dental work. Many over-the-counter toothache remedies contain eugenol as an active ingredient.
- Aromatherapy: Diffused for its warm, spicy scent. Some people find it comforting during cold and flu season.
- Food and beverages: Used in small amounts as a flavoring in baked goods, chai-style teas, and spice blends.
- DIY cleaning products: Added to homemade cleaners for its antibacterial properties and scent.
Safety and Dilution
Clove bud oil is potent and should not be applied undiluted to skin. Eugenol can cause irritation and sensitization at higher concentrations. International fragrance safety standards cap eugenol at quite low percentages depending on the product type: 0.45% for anything applied to the lips, 1% for products applied to the face or body with fingertips, and up to about 5% for rinse-off body products. For general topical use, diluting clove bud oil to around 1% in a carrier oil (roughly 6 drops per ounce of carrier) is a reasonable starting point.
Ingesting large amounts of clove oil is dangerous. As little as 10 to 30 mL of undiluted clove oil has caused severe liver and kidney injury in reported overdose cases, particularly in children. Symptoms of overdose include agitation, decreased consciousness, and coma within hours. The small amounts used in cooking or flavoring are not a concern, but the concentrated essential oil should be kept out of reach of children and never swallowed in undiluted form.
Interactions With Medications
Clove oil may affect how blood-thinning medications work. Preclinical evidence suggests it could influence the activity of warfarin, though no clinical studies in humans have confirmed this interaction yet. If you take anticoagulants or blood thinners, it’s worth being cautious about consuming clove oil supplements or using it in large amounts, since eugenol itself has mild blood-thinning properties that could compound the effect of your medication.