Educational information, not medical advice — ask your doctor or midwife.
Jambu is a small leafy herb from the daisy family. In English it is called the toothache plant. Its Latin name is Acmella oleracea.
Chew a leaf or a flower bud and your mouth will tingle, buzz, go numb and water.
In northern Brazil it is an everyday vegetable. Cooks use it in dishes such as tacacá and pato no tucupi. The same buzzing effect made it a folk remedy for toothache, sore gums and mouth sores across Latin America.
Long use in a tradition is not proof that a remedy works. It is not proof that it is safe either. Both have to be tested on their own.
For jambu, the mouth-tingling effect is real and easy to feel. Beyond that, human evidence is thin. Most of what is claimed rests on lab work, animal work or custom.
Today you will meet it in three ways. It is sold as food, as a numbing mouth gel or rinse, and as a skin cream item for smoothing fine lines.
The tingling and numbing you feel in the mouth is real and repeatable. It is not just a claim.
The herb is rich in spilanthol. This is a fatty compound known as an alkylamide.
In cell and tissue studies, spilanthol appears to act on sensory nerve endings. These include TRPA1 channels, which are nerve sensors for irritation.
First it excites the nerve, which gives the buzz. Then it dulls the nerve, which gives the numbness.
Saliva flow rises while you chew it. This is well described. It is one reason the herb is used before and during meals in Brazil.
In animal studies, extracts rich in spilanthol have reduced swelling and pain signals. In test tubes, extracts slow the growth of some mouth bacteria and fungi. Whether either of these matters in a real mouth infection has not been shown.
Makers of skin creams suggest spilanthol relaxes small face muscles. They say this eases the look of fine lines. The work behind this is mostly small and paid for by industry, so treat it as unsettled.
Animal studies also report more urine flow. So a mild diuretic (water pill) action is possible in people. It has not been measured properly in humans.
Jambu is sold and used in these forms:
- Fresh leaves and flower buds, cooked as a vegetable in Brazilian food - Dried loose herb for tea - Tinctures and liquid extracts in alcohol - Mouth gels, rinses and sprays for gum and tooth discomfort - Lozenges and chewing products, often sold on the tingle alone - Capsules of dried herb or extract - Creams and serums sold for the look of fine lines
Food use and strong extract use are very different. A plate of cooked jambu is a vegetable. An extract made to a set strength gives a much bigger dose of spilanthol in a small volume.
Jambu has deep roots in the Amazon basin. Native peoples of northern Brazil and nearby countries grew it as a food. They also used it on sore mouths and aching teeth.
Herbalists in Peru, Brazil and the Caribbean wrote it down for toothache, mouth ulcers, sore throat and poor appetite. Some older sources also listed it to bring on late periods. That is one reason it was avoided in pregnancy.
The plant travelled with trade. It picked up names across India, Africa and South East Asia. European gardeners grew it as the buzz button or electric daisy.
In the 1800s, dental writers in the West noted it as a mouth numbing herb.
In Pará state it is still a kitchen staple, not a medicine cabinet item. Interest from skin cream makers began in the 2000s. That is the newest chapter.
Stop and get urgent medical help if you have swelling of the lips, tongue, face or throat, a widespread rash, or trouble breathing or swallowing. These can be signs of a serious allergic reaction.
See a dentist the same day if a toothache comes with fever, facial swelling, pus or a bad taste from the gum. An infection can spread.
See your doctor if numbness or tingling lasts more than a few hours, if your mouth becomes sore or raw, or if you feel faint, dizzy or unusually thirsty after using extracts.
Tell your dentist or doctor that you have been using jambu before any dental work or surgery.
In Brazil jambu is an ordinary food vegetable and is sold in markets. In the United States it is used as a dietary supplement and a cosmetic ingredient, and it is not approved as a medicine. In the United Kingdom and the European Union it is sold mainly in cosmetics, and concentrated food extracts can raise novel food questions.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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