Charcoal, baking soda, lemon, oil pulling: whitening myths
What the evidence says about charcoal, baking soda, lemon, vinegar, oil pulling and turmeric for whiter teeth, and safer options that work.
Written by the Glowpedia team · not yet reviewed by our dentist
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Quick answer Most home whitening tricks are unproven or risky. The ADA says there isn't enough evidence that charcoal products are safe or effective, acidic fruits like lemon can erode enamel, and there's no reliable evidence that oil pulling or turmeric whitens teeth. Baking soda can lift some surface stain but doesn't change your natural tooth color.
Two ways teeth look whiter
A tooth can look whiter in two ways: by removing stain from the surface, or by bleaching color inside the tooth with hydrogen peroxide or carbamide peroxide. Scrubs and rubs can only do the first. Used too often or too hard, they also wear away enamel. Since the dentin underneath is naturally yellower, worn teeth can end up looking more yellow, and enamel doesn't grow back.
How abrasive is too abrasive?
Toothpaste abrasiveness is measured on the RDA scale (Relative Dentin Abrasivity), where a reference abrasive scores 100. The American Dental Association considers toothpastes at 250 or below safe for lifelong use, and every toothpaste with the ADA Seal must meet that limit. Many DIY powders and trendy pastes have never been tested this way. Whatever you use, a soft brush and light pressure matter as much as the paste.
Myth by myth
| Trend | The claim | What the evidence says |
|---|---|---|
| Activated charcoal | Absorbs stains | The ADA says there isn't enough evidence that charcoal products are safe or effective |
| Baking soda | Whitens naturally | Mild abrasive that can lift some surface stain; doesn't change natural color; plain powder has no fluoride |
| Lemon, orange, vinegar | Acid bleaches teeth | Acid erodes enamel, especially when rubbed on or left in contact |
| Strawberries with baking soda | Fruit acid whitens | One study found no measurable whitening |
| Oil pulling | Draws out stains | No reliable evidence it whitens or prevents cavities; the ADA doesn't recommend it |
| Turmeric | Brightens teeth | No reliable evidence |
Charcoal. Charcoal pastes and powders spread fast on social media, but a 2017 review in the Journal of the American Dental Association found no good evidence for their claims, and the ADA still says the evidence is insufficient. One study of a charcoal and salt mix found it abrasive and ineffective. If a charcoal product has no fluoride, it isn't protecting you from cavities either.
Baking soda. This one is more nuanced. Baking soda (sodium bicarbonate) is a fairly mild abrasive and is an ingredient in many regular toothpastes. The risk comes from DIY versions: dry powder scrubbed hard, no fluoride, or mixed with lemon juice or vinegar, which adds acid to abrasion. If you like it, use a fluoride toothpaste that contains baking soda.
Lemon and vinegar. Acid doesn't bleach teeth. It dissolves the enamel surface, which can bring sensitivity and a yellower look. Eating fruit with meals is fine; rubbing it on your teeth isn't.
Oil pulling. Swishing coconut or another oil for 10–20 minutes has no proven whitening effect. The ADA has noted reports of side effects such as stomach upset and, rarely, lipoid pneumonia from breathing in oil.
What works instead
- A whitening toothpaste with fluoride and the ADA Seal, for surface stain
- Professional cleaning and polishing at your checkup
- Peroxide strips or trays with the ADA Seal, or whitening supervised by a dentist; see teeth whitening options
- Fewer staining drinks, and water after them; see coffee, tea and wine stains
If your teeth are sensitive, read whitening and sensitive teeth first. The NHS advises against peroxide whitening during pregnancy or breastfeeding.
What you need for this
These open Amazon searches for the kind of product the guide describes; check the ingredients and reviews before you buy. As an Amazon Associate we earn from qualifying purchases.
See a dentist before whitening if you have sensitive teeth, gum problems, cavities, crowns or veneers, or a single darkened tooth. Stop any DIY method and book a visit if your teeth become sensitive, the edges start to look see-through, or your gums get sore.
Questions people ask
Is charcoal toothpaste safe to use every day?
There isn't enough evidence to say it's safe or effective, and some products are abrasive. A whitening toothpaste with fluoride and the ADA Seal is the better-tested choice.
Can I brush with plain baking soda?
It's a mild abrasive, but plain powder has no fluoride and won't change your natural tooth color. A fluoride toothpaste that contains baking soda gives you the stain-lifting effect plus cavity protection.
Does oil pulling do anything for teeth?
There's no reliable evidence that it whitens teeth or prevents cavities, and the ADA doesn't recommend it. It should never replace brushing and cleaning between your teeth.
Does lemon juice whiten teeth?
No. Its acid softens and dissolves enamel, which can make teeth more sensitive and look more yellow over time.