There’s been a lot of hype around the Internet, social media and even on store shelves about using activated charcoal for its teeth whitening affects. Like any trendy new dental hygiene tip, we decided to take a closer look at the charcoal teeth whitening trend, and here is what we want you to know.

We’ve seen posts and articles about using raw activated charcoal or toothpastes with charcoal mixed in to clean your teeth with the expectation that it has natural teeth whitening properties. The logic comes from the fact that activated charcoal is used in emergency rooms to absorb toxins and that the charcoal will do the same thing to your teeth. Some sources also say that the charcoal will remove bacteria and freshen your breath by restoring pH balance.

While it is possible that charcoal may remove surface stains and have other benefits, as dental professionals, we also worry that it may be too abrasive (i.e. rough) for enamel that makes up the outside layer of your teeth and protects them from decay or sensitivity. Regular toothpastes, especially whitening toothpastes, contain abrasives that are known to be safe on teeth. It’s possible that charcoal is dangerously rough on teeth, but we don’t know yet.

The American Dental Association conducted a review of all the available research on the use of charcoal in oral hygiene and came to the conclusion that there isn’t enough scientific evidence supporting or refuting claims that many charcoal products make. They called for more studies to be done in the future to get to the bottom of charcoal’s affect on teeth and advised that dentists tell their patients to be cautious about using charcoal on their teeth.

When it comes trendy tooth care, whether charcoal or any other trend you see online or hear about from a friend, use this analogy: Think of your mouth like the engine of your car. Imagine coming around saying they discovered you can use a cheap household product like rubbing alcohol to fuel your car. The alcohol will make your car run really smoothly for the first few hundred miles, then it might start wearing away at the parts inside your engine so it doesn’t run right anymore. Would you want to fuel up with the alcohol, or stick to good old gasoline?

The truth is, we’re just not sure if charcoal is good for your teeth or bad. Since there’s no proof that it’s safe, we advise sticking to tried and true dental hygiene tools: your toothbrush, floss, fluoride toothpaste and if needed, occasional professional teeth whitening at the dentist.

Every few years a new dental care fad pops up and we dentists and hygienists start hearing tons of questions about whether the latest dental home remedy or DIY tooth care product really works. One of the most popular ones we’ve seen lately is using activated charcoal paste to whiten teeth. Some video bloggers are claiming amazing teeth whitening effects, but many patients are wondering whether this technique really works, and more importantly, whether it is safe.

The quick answer to both questions is: we don’t know yet. Viable studies have not been completed yet on whether charcoal can remove stains from teeth or whether charcoal can damage teeth.

In case you aren’t familiar with it, charcoal teeth whitening involves adding water to a fine powder of charcoal to make a paste. You then use this paste to brush your teeth with a regular toothbrush for three to five minutes. Supposedly, after you rinse the ghoulish-looking black paste from your mouth, you’re left with an ultra-white, megawatt smile.

The idea behind the trend is reasonable enough. Charcoal has been used for centuries as a purifying agent. Activated charcoal is very porous, and all the tiny little holes on its surface grab on to toxins and particles. That’s why charcoal is used in water filters and by as poison control in emergency rooms. However, whether this purifying effect works on teeth is not known, though in theory the concept does make sense.

Regardless of whether charcoal can be effective for teeth whitening, the more important question is if it is safe. It is possible that charcoal is too abrasive for your teeth, meaning that if the charcoal is too rough, it can damage and strip away the outer layer of your teeth (the enamel). This may not cause a problem after just one use, however, if a patient uses charcoal on their teeth repeatedly over time, they may wear out their teeth, leaving them vulnerable to sensitivity and decay.

Given that we don’t really have any evidence or studies to prove either the effectiveness or safety of charcoal teeth whitening, we can’t say that we recommend it. There are plenty of reasonably priced tooth whitening products at the drugstore that are known to be effective and safe that we’d rather patients use. And remember, the best person to ask for advice about whitening your smile is your dentist, your smile-care professional!