Putting toothpaste on your face will most likely irritate your skin, not help it. The ingredients in toothpaste are formulated for tooth enamel, not skin, and many of them actively strip moisture, trigger redness, and can even cause chemical burns on sensitive facial tissue. Despite its long reputation as a DIY pimple treatment, toothpaste tends to leave you with a redder, more inflamed spot than you started with.
Why Toothpaste Irritates Facial Skin
Toothpaste is a surprisingly complex product. It contains surfactants, detergents, abrasives, fluoride salts, antiseptics, and flavoring agents, all designed to scrub plaque off hard enamel surfaces. Your facial skin is far thinner and more reactive than tooth enamel, so these ingredients hit it hard.
Sodium lauryl sulfate (SLS), the foaming agent in most toothpastes, is a known skin irritant. It strips the natural oils from your skin’s surface, disrupting the moisture barrier that keeps skin healthy. On your face, this doesn’t just cause dryness. It can trigger stinging, burning, and visible redness within minutes. Abrasive particles meant to polish teeth act like sandpaper on delicate facial tissue, and menthol or peppermint oil creates a cooling sensation that many people mistake for “working” when it’s actually a mild chemical irritation.
What You’ll Notice After Applying It
The immediate effects depend on how sensitive your skin is and how long you leave the toothpaste on. Most people experience a tingling or burning sensation first, followed by visible redness once they wash it off. If you leave it on overnight (a common recommendation in the DIY world), you’re more likely to wake up with dry, flaking skin and a pimple that looks angrier than before.
In more reactive skin, toothpaste can cause genuine contact dermatitis: itching, swelling, peeling, and in some cases blistering. Flavoring agents, particularly cinnamon-derived compounds, are the most common triggers for allergic reactions. These reactions can extend well beyond the spot where you applied the toothpaste, spreading across surrounding skin as eczema-like patches. In rare cases, cinnamon-based flavorings have even caused skin whitening (a condition called contact leukoderma) around the mouth area.
The Pimple Treatment Myth
The idea that toothpaste treats acne traces back to an ingredient called triclosan, an antibacterial compound that was once thought to kill acne-causing bacteria. But triclosan’s effectiveness was always debated, and the FDA moved to limit its use significantly. As of 2019, no toothpaste sold in the U.S. contains triclosan. The original logic behind this home remedy no longer applies to any product you’d find on store shelves.
What toothpaste does do is dry out the surface of a pimple. That can make it look smaller temporarily, but it doesn’t address the clogged pore or bacteria underneath. Meanwhile, the irritation and inflammation toothpaste causes can actually slow healing and make the blemish more noticeable. You’re trading a day of slightly drier skin for prolonged redness and potential peeling.
Fluoride and Perioral Dermatitis
Repeated toothpaste contact with facial skin has a more serious potential consequence. Fluoride and tartar-control agents in toothpaste have been linked to perioral dermatitis, a stubborn rash of small red bumps that clusters around the mouth, nose, and sometimes eyes. One study of 20 women found that perioral dermatitis developed within one to two weeks of starting a tartar-control toothpaste, and it took up to six weeks to clear after they stopped using it.
In one documented case, a woman developed a facial rash after switching to a high-fluoride prescription toothpaste. The rash resolved completely within three weeks once she stopped using the product, with no other treatment needed. While the connection between fluoride and this condition isn’t fully established in large studies, the pattern in case reports is consistent enough that dermatologists routinely ask patients with perioral dermatitis about their toothpaste.
If you’re someone who already gets this kind of rash and you’re deliberately applying toothpaste to your face, you’re dramatically increasing your exposure to a known trigger.
What Actually Works on Pimples
Over-the-counter spot treatments designed for skin are cheaper and more effective than toothpaste, with none of the collateral damage. The three active ingredients dermatologists recommend most are benzoyl peroxide, which kills acne-causing bacteria directly; salicylic acid, which unclogs pores by dissolving the dead skin cells trapped inside; and adapalene, a retinoid that reduces inflammation and prevents new breakouts from forming. All three are available without a prescription at any drugstore.
For a single pimple, a benzoyl peroxide spot treatment applied at night will do what people hope toothpaste does: shrink the blemish, kill bacteria, and dry it out, without burning or irritating the surrounding skin. These products are formulated at concentrations and pH levels that are safe for facial tissue. Toothpaste is not.
If you’ve already put toothpaste on your face and your skin is red or irritated, wash it off gently with lukewarm water, apply a basic fragrance-free moisturizer, and give your skin a day or two to calm down. For most people, the irritation is temporary. But if you notice blistering, spreading redness, or a bumpy rash that doesn’t resolve within a few days, that’s worth a trip to a dermatologist.