In recent years, a viral skincare hack has taken the internet by stormâusing Colgate toothpaste and Vaseline on the skin to treat issues like dark underarms, acne, and hyperpigmentation. Social media platforms are filled with dramatic âbefore and afterâ photos that promise incredible transformations with just a few applications of this unlikely combination. But is it fact or fiction? Is this a dermatologist-approved trick or a dangerous DIY trend?

In this article, we dive deep into the science, testimonials, and best practices behind using Colgate toothpaste and Vaseline on your skin. Youâll learn the real effects, potential risks, and how (if at all) to safely use this mixture on your face or body.
Whatâs Inside Colgate Toothpaste?
Colgate toothpaste is formulated to clean and protect your teeth, not your skin. Its key ingredients include:
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Fluoride â helps prevent cavities
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Hydrated silica â a mild abrasive used for polishing teeth
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Triclosan or sodium lauryl sulfate â antibacterial agents
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Menthol â gives a cooling, refreshing sensation
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Glycerin â a hydrating agent
While some of these ingredients like menthol and baking soda (in certain versions) have drying or antibacterial effects, othersâlike fluoride and triclosanâcan be harsh and irritating to sensitive skin.
What Does Vaseline Do for the Skin?
Vaseline, a brand name for petroleum jelly, acts as an occlusive barrier, locking in moisture and protecting the skin. Itâs widely used for:
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Healing dry skin and cracked lips
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Soothing irritation and burns
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Preventing moisture loss
Vaseline is non-comedogenic (it doesnât clog pores), which makes it relatively safe for dry or sensitive skin types. However, when combined with irritating substances like toothpaste, the results can vary significantly.
Why People Are Mixing Toothpaste and Vaseline
Many online tutorials and viral videos claim this mix can:
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Lighten dark underarms and knees
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Reduce acne overnight
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Clear hyperpigmentation
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Soften skin
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Even out skin tone
The logic? Toothpaste is believed to âdry outâ pimples and act as an antiseptic, while Vaseline helps reduce irritation and lock in moisture.
But does the science back it up?
What Happens When You Apply Toothpaste and Vaseline to Your Skin
Letâs break this down by application:
1. On Underarms (for Whitening and Softening)
Using Colgate toothpaste on dark underarms has gained popularity due to its supposed bleaching and cleansing properties. The menthol in toothpaste gives a fresh feeling, and when mixed with Vaseline, itâs said to âliftâ dirt and dead skin.
The truth: Toothpaste may temporarily lighten skin by removing surface debris, but long-term use can irritate the sensitive underarm area. Vaseline, on the other hand, may help soften the area but wonât lighten pigmentation.
â Safe Tip: Use this mixture only once or twice a week, and always patch test before applying to large areas.
2. On Acne-Prone Skin (for Spot Treatment)
Many users apply the toothpaste-Vaseline mix on acne, claiming that it dries pimples overnight while preventing irritation from toothpaste alone.
Reality Check: While toothpaste may dry out small pimples, it can also cause burns, redness, and inflammation, especially on darker skin tones. Vaseline does not treat acne but may trap heat or bacteria if applied over active breakouts.
â Safe Tip: Use salicylic acid or benzoyl peroxide for acne instead. If you must try the hack, limit it to very small, individual pimplesânot your entire face.
3. For Hyperpigmentation and Dark Spots
Some TikTok influencers swear by the brightening effect of Colgate + Vaseline on dark patches, acne scars, and pigmentation.
But here’s the catch: Colgate does not contain any proven skin-lightening ingredients. The perception of skin becoming lighter may come from the drying effect, which fades once the skin returns to normal. In some cases, it may even worsen pigmentation due to irritation.
â Safe Tip: Try natural brightening alternatives like turmeric, lemon juice (with caution), or niacinamide instead.
Before and After Results: Are They Real?
Letâs address the dramatic before-and-after images.
While many claim this mix gave them brighter underarms or clearer skin, others report the exact oppositeâincluding rashes, burning, and scarring. The truth is, results vary depending on skin type, sensitivity, and proper usage.
For example:
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Oily skin types may find temporary relief from pimples.
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Dry or sensitive skin may suffer irritation or flakiness.
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Dark skin tones are more prone to post-inflammatory hyperpigmentation if the skin is irritated.
Dermatologists Weigh In
Most skin experts strongly discourage using toothpaste on skin, especially on the face. According to dermatologists:
âToothpaste contains ingredients that are not intended for use on skin. They can disrupt the skin barrier and cause more harm than good.â â Dr. Anjali Mahto, Consultant Dermatologist
However, Vaseline continues to be a dermatologist-recommended product for hydrating and healing dry skin, eczema, and wound protection.
Safer Alternatives for Each Skin Concern
If you’re dealing with common skin issues, here are evidence-based alternatives you should consider:
ConcernBetter AlternativeDark underarmsAloe vera gel, turmeric & honey pasteAcne or pimplesSalicylic acid, tea tree oil, benzoyl peroxideDark spotsNiacinamide serum, vitamin C, azelaic acidDry skin or irritationPetroleum jelly, ceramide creams
Remember: Quick fixes are tempting, but consistency with proven ingredients will always give better and safer results.
How to Safely Test This Hack (If You Still Want To Try)
If youâre curious to try the Colgate + Vaseline trick, hereâs how to minimize risks:
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Patch test: Apply the mixture to a small area of your inner arm and wait 24 hours.
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Use small amounts: Donât slather it all over your skin.
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Limit frequency: Try no more than twice a week.
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Moisturize afterward: Use aloe vera or a calming lotion to soothe skin.
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Stop if irritation occurs: Redness, itching, or stinging is your cue to discontinue immediately.
Final Verdict: Miracle or Myth?
Using Colgate toothpaste and Vaseline on your skin is a viral beauty hack that promises dramatic resultsâbut the science and dermatological evidence donât fully support it. While a small number of users may experience short-term benefits for acne or underarm brightening, the risks of irritation and long-term damage far outweigh the temporary effects.
If youâre serious about improving your skin, trust proven skincare ingredients and be wary of DIY hacks that come without proper research. Your skin is a delicate organâtreat it with care, and it will return the favor with lasting radiance.