Toothpaste can dry out a pimple temporarily, but dermatologists strongly advise against using it as a spot treatment. The same ingredients that create that drying effect, like baking soda, alcohol, and hydrogen peroxide, can damage your skin’s protective barrier, trigger inflammation, and even leave scars. Cheap, widely available alternatives work faster and safer.
Why Toothpaste Seems to Work
The idea isn’t completely random. Older toothpaste formulas contained higher concentrations of baking soda, hydrogen peroxide, and menthol, all of which can strip oil from skin. When you dab toothpaste on a pimple overnight, these ingredients pull moisture out of the blemish, making it look smaller by morning. Menthol adds a cooling sensation that tricks your nerves into feeling like something productive is happening. It’s a counterirritant: it stimulates the nerves that sense pain and itching, creating that tingly “it’s working” feeling while potentially masking real irritation underneath.
The problem is that shrinking a pimple by stripping it of moisture is not the same as healing it. You’re dehydrating the surface without addressing the bacteria, excess oil, or clogged pore that caused the breakout in the first place.
The Damage Toothpaste Does to Skin
Your skin sits at a mildly acidic pH, roughly 4.7 to 5.7, which maintains what’s called the acid mantle. This thin barrier fights off bacteria and locks in moisture. Toothpaste is formulated for your teeth, not your face, and its pH reflects that. A study of fluoride toothpastes with calcium carbonate found pH levels ranging from 8.67 to 10.03, significantly more alkaline than skin. Smearing that on your face disrupts the acid mantle and leaves skin vulnerable.
Each of the active drying ingredients causes its own type of harm:
- Alcohol strips skin so aggressively that the American Academy of Dermatology recommends against using acne products containing it. It can redden, irritate, and over-dry skin, which often triggers your oil glands to produce even more sebum, making acne worse.
- Hydrogen peroxide interferes with your skin’s natural healing process. Rather than helping a pimple resolve cleanly, it can cause scarring or make existing scars more pronounced.
- Baking soda removes the protective bacterial layer your skin relies on to fight infection. With that defense stripped away, you become more prone to new breakouts, not fewer.
The combined effect of these ingredients can introduce infection, worsen inflammation, and leave acne scars that last far longer than the pimple would have on its own.
Fluoride and Facial Rashes
There’s another risk most people don’t consider. Fluoride in toothpaste has been linked in case reports to a condition called perioral dermatitis, a rash of small red bumps and pustules that clusters around the mouth, nose, and chin. It looks a lot like acne but doesn’t respond to acne treatments. In one documented case, a woman developed erythema and clusters of tiny pustules on her chin and around her mouth after starting a high-fluoride toothpaste. She stopped using it, and the rash cleared completely within three weeks with no other treatment.
So not only can toothpaste fail to fix your pimples, it can create an entirely new skin problem that mimics acne and takes weeks to resolve.
What Actually Works as a Spot Treatment
Two over-the-counter ingredients have strong evidence behind them, cost roughly the same as toothpaste, and are available at any drugstore.
Benzoyl peroxide is the gold standard for killing acne-causing bacteria. It works by introducing oxygen into the pore, which destroys the bacteria that thrive in low-oxygen environments. You don’t need a strong concentration. Products at 2.5% or 5% are generally just as effective as higher percentages while causing far less irritation. Apply a thin layer directly to the pimple. You’ll typically see results within a day or two for surface-level breakouts.
Salicylic acid takes a different approach. Instead of targeting bacteria, it penetrates deep into the pore to dissolve excess oil and dead skin cells that are clogging it. This makes it especially effective for whiteheads and blackheads. It’s generally gentler than benzoyl peroxide, so if your skin is sensitive or dry, it’s a good starting point. Look for a concentration between 0.5% and 2%.
These two ingredients address the actual causes of pimples rather than just drying out the surface. A small tube of either one costs a few dollars and lasts months, since you only need a tiny amount per application.
If You Already Used Toothpaste
If you’ve already applied toothpaste and your skin feels tight, red, or stinging, wash it off with lukewarm water and a gentle cleanser. Pat dry and apply a simple, fragrance-free moisturizer. Your skin’s barrier needs time to recover, so avoid applying any active acne treatments to the irritated area for a day or two. The redness and dryness should fade within a few days.
If you notice a cluster of small bumps developing around your mouth or chin after repeated toothpaste use, that may be perioral dermatitis rather than acne. Stop applying toothpaste to your skin and give it a few weeks. If the rash persists, a dermatologist can confirm the diagnosis and recommend treatment.