Activated Charcoal for Teeth Whitening, Detox and Gas: Claims Checked
Charcoal toothpaste, charcoal detox pills and charcoal for gas, checked against dental reviews, NIH and poison-center sources, with what charcoal can do to your medicines.
Content last updated . This page has not been medically reviewed.
Safety first. Natural products can cause side effects and interact with medicines. Read natural ingredient safety before you use anything on this page.
Charcoal is a poison treatment given under clinician direction. If someone may have swallowed something harmful, do not reach for charcoal tablets: use the Poison Control online tool or call 1-800-222-1222, and call 911 for collapse, seizure, trouble breathing or if the person cannot be awakened. [1][2] See Activated charcoal and poisoning.
The claims as marketed
Activated charcoal is sold as a toothpaste or powder that "whitens", as a capsule or drink that "detoxes" or "removes toxins", and as a tablet for gas and bloating. Poison Control notes that some over-the-counter products make claims of adsorbing toxins and decreasing bad breath. [1] This page checks each claim against the sources we could read. Everything here is information, not a recommendation to use or avoid a product.Evidence, claim by claim
| Claim | What the source found | Evidence label |
|---|---|---|
| Charcoal toothpaste whitens teeth | A 2023 systematic review of laboratory (in vitro) studies, 11 of them included and rated medium-high risk of bias, found results varied. Charcoal toothpastes had a lower whitening effect than other options. [3] | Insufficient evidence; mostly laboratory studies |
| Charcoal toothpaste is safe for enamel | The same review found most studies agree charcoal toothpaste is more abrasive, and said it can be considered less safe because of that. [3] A 2017 literature review found insufficient clinical and laboratory data to back its safety claims. [4] | Insufficient evidence of safety |
| Charcoal toothpaste kills germs or "detoxes" the mouth | The 2017 review found internet advertisements with unsubstantiated therapeutic claims, including antibacterial, antifungal, antiviral and oral detoxification. [4] | Marketing claim |
| Charcoal removes toxins from the body | NCCIH reports a 2015 review that found no compelling research that "detox" diets eliminate toxins from the body. [5] | No good evidence of benefit for detox diets; Proper evidence not found for charcoal products (searched PubMed and NCCIH) |
| Charcoal helps gas | A 1981 placebo-controlled experiment reported fewer flatus events after a gas-producing meal. [6] A 2004 review concluded there is no consistent evidence to support gas-reducing substances such as charcoal or simethicone. [7] | Mixed; small and old studies |
What dental sources add
- Little human data. A study of charcoal products sold in Brazil found 22 published articles, 21 of them in vitro (laboratory) studies, and the single clinical study was sponsored by a charcoal product and had no control group. [8]
- Fluoride. In that same product survey, only 3 products contained fluoride. [8] Check the label for fluoride.
- Ingredients vary. One-third of the charcoal toothpastes in the 2017 review contained bentonite clay. [4] See Bentonite clay.
- A dentist can say whether a product suits your teeth, gums and any dental work. The sources we read do not cover children, pregnancy or dental restorations specifically, so we make no claim about them.
Can charcoal affect medicines and supplements?
Yes, in the one trial we read. Eight healthy volunteers took a cimetidine tablet and then charcoal, which reduced absorption of most of the cimetidine dose. [9] Poison Control describes charcoal as adsorbing many poisons in the gut. [1] The sources we read do not list which everyday medicines or supplements are affected, so ask a pharmacist before taking charcoal near any medicine. See how interactions work.What a reader can safely do
Check the label for fluoride and other ingredients, ask a dentist about whitening, ask a pharmacist about medicines, and use the at-a-glance table or the detox claims check for other claims.Frequently asked questions
Does charcoal toothpaste whiten teeth?
The evidence we read is limited. A 2023 systematic review found mixed results and a lower whitening effect than other alternatives. [3]
Is charcoal toothpaste bad for enamel?
That review found most studies agree charcoal toothpaste is more abrasive. [3] A 2017 review also found insufficient safety data. [4] A dentist can advise on your teeth.
Does charcoal detox the body?
We found no evidence that it does. NCCIH reports a 2015 review that found no compelling research that "detox" diets eliminate toxins. [5]
Does charcoal stop gas?
Studies are mixed: one old placebo-controlled experiment was positive, and a 2004 review found no consistent evidence. [6][7]
Can I take charcoal with my medicines?
Ask a pharmacist. Charcoal sharply reduced absorption of one medicine in a small volunteer study. [9]
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.
Safety notes
- Poison Control says activated charcoal should not be taken by anyone with gastrointestinal bleeding, a bowel perforation or a bowel blockage. [1]
- Reported side effects include nausea and vomiting, and breathing the powder or slurry into the lungs if very drowsy. [1]
- Over-the-counter products might not be as "activated" as hospital charcoal. [1]
- Tell your surgical team about any supplement you use, including charcoal.
References
- Poison Control (America's Poison Centers). Activated charcoal: An effective treatment for poisonings. Clinical toxicologists named on the page. Read 2026-10-23.
- Poison Control (America's Poison Centers). Poison Control home page. Read 2026-10-23.
- Effectiveness and abrasiveness of activated charcoal as a whitening agent: A systematic review of in vitro studies. Ann Anat. 2023. PubMed 36183933. Read 2026-10-23.
- Brooks JK, Bashirelahi N, Reynolds MA. Charcoal and charcoal-based dentifrices: A literature review. J Am Dent Assoc. 2017. PubMed 28599961. Literature review. Read 2026-10-23.
- National Center for Complementary and Integrative Health (NIH). “Detoxes” and “Cleanses”: What You Need To Know. Read 2026-10-23.
- Effects of orally administered activated charcoal on intestinal gas. Am J Gastroenterol. 1981. PubMed 7015846 (abstract read). Read 2026-10-23.
- Treatment of Excessive Intestinal Gas. Curr Treat Options Gastroenterol. 2004. PubMed 15238205 (abstract read). Narrative review. Read 2026-10-23.
- Charcoal-based dentifrices and powders: analyses of product labels, Instagram engagement, and altmetrics. Braz Dent J. 2021. PubMed 34614064. Read 2026-10-23.
- Drug adsorption efficacy and palatability of a novel charcoal cookie formulation. Pharmacotherapy. 2010. PubMed 20795844 (abstract read). Read 2026-10-23.