Tongue Scraping: What It Is and What Research Shows
What tongue scraping is, its place in Ayurvedic daily practice, what trials and reviews found for bad breath and other claims, and how to avoid injury.
Content last updated . This page has not been medically reviewed.
What it is
Tongue scraping means gently cleaning the top surface of the tongue with a scraper or tongue cleaner. In Ayurveda it is known as jivha lekhana and is listed with tooth cleaning and oil swishing among the oral hygiene procedures of the tradition. [1] It is part of dinacharya, the daily routine. See The Ayurvedic Morning Routine. Tongue cleaning is also common outside Ayurveda, and the UK National Health Service lists cleaning the tongue once a day with a scraper or cleaner as one way to help with bad breath. [2]Why tongue cleaning is proposed to help
The modern explanation is about bacteria. A review of oral malodor (bad breath) says that in many cases the evidence points to anaerobic bacteria in the coating on the tongue, and that management aims to reduce the bacterial load, including by brushing or scraping the tongue. [3] That is a proposed mechanism for breath. The Ayurvedic reason is different: the tradition links tongue cleaning with digestion. That is a traditional idea, and a trial that tested it is described below.What research shows
| Question | What the source found | Evidence label |
|---|---|---|
| Does scraping reduce bad breath compared with brushing the tongue? | A Cochrane review of two small trials (40 people) found weak, unreliable evidence of a small difference in sulfur compound levels. [4] That review was later withdrawn, to be replaced by a broader one. [5] | Mixed |
| Does adding tongue cleaning help over normal care for two weeks or more? | A 2015 systematic review found very limited evidence and called any effect of a tongue scraper unclear. [6] | Insufficient evidence |
| Does it change Ayurvedic "digestive power" and oral health quality of life? | One randomized crossover study in 58 healthy adults (57 finished) tested morning scraping for 4 weeks against waiting. Self-reported constipation improved (odds ratio 2.80, 95% CI 1.04 to 7.58) and the oral health score rose by 4.33 points. [7] | Promising but limited |
How to read this. The digestion result comes from a questionnaire built on Ayurvedic ideas, and people knew whether they were scraping, so expectation can affect self-reported results. The study was small and short. We did not find a larger replication. The result should not be read as proof that tongue scraping treats constipation.
Two more points. In the two small trials, reduced sulfur compound levels could not be detected for more than 30 minutes after any of the methods, so any breath benefit was brief. [4] And a BMJ Clinical Evidence review of treatments for physiological bad breath, which included cleaning, brushing or scraping the tongue, noted that an estimated 40% of people with halitosis have no underlying organic disease. [8]
What it can and cannot do
Tongue cleaning may be a simple, low-cost part of oral hygiene. It does not replace tooth brushing with fluoride toothpaste twice a day, cleaning between teeth, or dental check-ups. [9] [2] This site does not provide a tongue self-diagnosis tool. For the clinical use of tongue observation in some traditions, see Tongue Examination and the Eight-Fold Examination.Related guides
See Oil Pulling and Ayurvedic Dental and Oral Care for other mouth practices.Frequently asked questions
Is tongue scraping an Ayurvedic practice?
Yes. It is described as jivha lekhana, one of the oral hygiene procedures in the tradition. [1] It is also advised in mainstream oral care for bad breath. [2]
Does tongue scraping cure bad breath?
Not reliably. Reviews found weak or unclear evidence, and any short-term improvement in breath measures faded within about 30 minutes in the small trials. [6] [4]
Does tongue scraping help digestion?
One small randomized crossover study found improvements in self-reported items such as constipation, using an Ayurvedic questionnaire. It was small, and we found no larger confirmation. [7]
Can tongue scraping hurt?
It can cause gagging or soreness if done too hard or too far back. The NHS advises not to clean so hard that the tongue bleeds. [2]
When is bad breath a sign of something else?
When it lasts for several weeks despite good oral care, or comes with sore or bleeding gums, toothache or sinus symptoms, see a dentist or doctor. [2] [8]
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
Side effects and safety
- Gagging and nausea. Scraping too far back can trigger gagging. The NHS says to clean the tongue gently. [2]
- Injury. The NHS advises not to brush so hard that your gums or tongue bleed. [2] Bleeding or soreness that does not settle is a reason to stop and see a dentist.
- What trials reported. In one of the two small trials, adverse effects of brushing the tongue with a toothbrush were nausea (60%) and trauma (10%), and all participants were receptive to using the tongue scraper. [4]
- Material and cleanliness. We did not find a source comparing scraper materials, so we make no claim about metal versus plastic. Keep any scraper clean and replace it if it is damaged.
Who should check first
When to see a dentist or doctor
References
- Effect of Ayurvedic herbs on control of plaque and gingivitis: A randomized controlled trial. Ayu 2011. Read 2026-10-22.
- National Health Service (NHS, UK). Bad breath. Read 2026-10-22.
- Oral malodour: a review. Archives of Oral Biology 2008. Read 2026-10-22.
- Tongue scraping for treating halitosis. Cochrane Database of Systematic Reviews 2006 (later withdrawn). Read 2026-10-22.
- WITHDRAWN: Tongue scraping for treating halitosis. Cochrane Database of Systematic Reviews 2016. Read 2026-10-22.
- Treatment of oral malodour. Medium-term efficacy of mechanical and/or chemical agents: a systematic review. Journal of Clinical Periodontology 2015. Read 2026-10-22.
- Effects of tongue cleaning on Ayurvedic digestive power and oral health-related quality of life: A randomized cross-over study. Complementary Therapies in Medicine 2018. Read 2026-10-22.
- Halitosis. BMJ Clinical Evidence 2014. Read 2026-10-22.
- National Health Service (NHS, UK). How to keep your teeth clean. Read 2026-10-22.