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Slippery Slope: Saliva Does More for Our Teeth Than Thought Possible


Has your mom ever told you to not spit out your saliva or to stop drooling? She may have had a point to yelling at you, as studies show the importance of saliva in your mouth. Saliva may contain important organisms that naturally protect against Streptococcus and by paying more attention to the natural responses our body has to offer, we will continue to find interesting new happenings in our body!

What Does Saliva do for Your Teeth?

So is saliva harmful for your teeth? Mucus is part of the 0.5% of saliva not water and contains salivary mucins, compounds that actively protect teeth from damage by the cavity-causing bacterium Streptococcus mutans, according to a new study. Previously it was thought that salivary mucins – large glycoproteins - did little more than keep mucus in saliva slippery and elastic, contributing to its gel-like properties. But now it seems they play an active role in defending against pathogens and keeping the human microbiome healthy.

The proof is in the spit

Erica Shapiro Frenkel, of Harvard University, and principal investigator Katharina Ribbeck, a professor at the Massachusetts Institute of Technology, both in Cambridge, MA, report their findings in the journal Applied and Environmental Microbiology. Frenkel says their findings suggest boosting the body’s natural defences might be a better way to prevent tooth decay than relying on external agents like sealants and fluoride treatments.

Watch the biofilms

The researchers found that salivary mucins do not alter levels mutans nor kill the bacteria over 24 hours. Instead, they keep the bacteria suspended in a liquid medium, and this in turn reduces their ability to form biofilms on teeth. “This is particularly significant for S. mutans,” Frenkel explains, “because it only causes cavities when it is attached, or in a biofilm on the tooth’s surface.”

A biofilm is a densely packed community of microbes that grow on surfaces and surround themselves with sticky polymers that they secrete. Frenkel also points out that the oral microbiome – the collection of friendly bacteria in the mouth – is better preserved when naturally present species are not killed. “The ideal situation,” she adds, “is to simply attenuate bacterial virulence.”  mutans causes tooth decay by first attaching itself to teeth by forming a biofilm from sticky polymers that it produces.

As the bacterium grows under the protection of the biofilm, organic acid byproducts of its metabolism attack the tooth enamel, causing cavities. For their study, the researchers focused on how the salivary mucin MUC5B affects the ability of S.mutans to attach to teeth and form a biofilm. These are the two key steps necessary for cavities to form, Frenkel explains.

Pig test

The investigation grew out of previous work looking at gastric mucins in pigs that protected against lung pathogens. The researchers wondered if salivary mucins might also play a protective role. Frenkel says common diseases like cystic fibrosis, ulcerative colitis and asthma have been linked to problems with mucin production.

“There is increasing evidence that mucins aren’t just part of the mucus for structure or physical protection, but that they play an active role in protecting the host from pathogens and maintaining a healthy microbial environment,” she adds. Prof. Ribbeck says this kind of research is important because it changes scientists’ views on host-microbe interactions:

“It is generating a paradigm shift from the textbook view of mucus as a simple catchall filter for particles, towards the understanding that mucus is a sophisticated bioactive material with powerful abilities to manipulate microbial behavior.” Meanwhile, Medical News Today recently learned that Roman Britons had less gum disease than modern Britons. The surprising discovery provides further evidence that modern habits like smoking can be damaging to oral health.

Saliva’s Job in Your Mouth

The importance of saliva in your mouth is more than just keeping your mouth from drying out There are so many other reasons your spit keeps your teeth healthy.

You wouldn’t eat

Without the help of saliva, you wouldn’t have the ability to chew your delicious food or even taste it. The next time you have a delicious and flavorful dinner, you can thank your saliva for having your back.

You’d have bad breath

Your saliva is the protector of keeping your mouth ready for kissing, as it prevents your breath from being smelly. Let’s be honest, your crush will be thankful for saliva, too.

Your dentures wouldn’t stay in place

If you have to place your dentures, your saliva is the keeper of your denture alignment. Saliva helps maintain your dentures in the right place so you won’t have a crooked smile.

Maintain Your Saliva Game Strong

When you visit your dentist at Cabrillo Family Dental Care, we will ensure your saliva is doing what it is supposed to do. Our family dentistry will care for you and your family’s teeth. Schedule an appointment with us today!