Saliva: Functions and Benefits for Oral Health

Saliva is one of the most neglected factors in your oral and overall health. The normal secretion of saliva is also vital to a healthy mouth, free of cavities, and to proper digestion.

Let’s discuss the functions of saliva, the benefits of healthy saliva, and what to do if you produce too much or too little.

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What is saliva?

Saliva, or “spit”, is an extracellular fluid produced by the salivary glands in the mouth. Saliva carries important enzymes that break down food particles, which is the first stage of the digestion process. It also delivers minerals and other nutrients to your teeth that teeth use to remineralize.

What is saliva made of? Saliva is made up of:

• Water (95% of the composition of saliva)
• Electrolytes (sodium, potassium, calcium, magnesium, bicarbonate, and phosphates)
• Mucus
• Enzymes
• Immunoglobulins (IgA, etc.)
• Proteins
• Secretory mucins, lactoferrin, lysozyme, peroxidase, and other antibacterial compounds
• Nitrogenous compounds (urea, ammonia, and others)

Healthy saliva is slightly acidic, ranging from about 6-7 pH. This allows saliva to do its job of breaking down food and protecting the mouth from a buildup of bacteria.

Learn More: Holy Spit: Saliva’s Role in Cavities (EPISODE 22: What’s the Juice Podcast with Organic Olivia)

The viscosity (thickness and flow) of your saliva changes based on your sympathetic and parasympathetic nervous system activity. This means that when you enter “fight, flight, or freeze” mode, the consistency of your saliva changes.

Functions of Saliva

1. Clearing Food Debris

Saliva cleans away food debris in the mouth. When you have good saliva flow, food particles are less likely to collect and ferment on your teeth or other areas of your oral cavity.

2. Tasting

Molecules in food that taste of distinct flavors must first be solubilized, or made more soluble (dissolvable) before you can actually taste your food.

Your saliva interacts with taste buds to unmask the tastes offered by different foods.

3. Beginning the Digestive Process

Chewing and swallowing begin digestion, but they would be useless without saliva.

As you chew, the saliva in your mouth binds food particles together into a “bolus,” a slippery substance that easily enters the esophagus. The enzyme amylase breaks down food particles into simpler compounds, which is the first step to digesting food.

The compounds in saliva also protect your throat and esophagus from what would otherwise irritate or damage their sensitive tissue.

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Let’s talk about spit. • When we think oral health, many of us think immediately of the gums, the teeth, and the tongue. But the unsung hero of a healthy oral microbiome — and, therefore, a healthy mouth — is SALIVA. • If your saliva flow is poor or it tastes “metallic”, chances are that you’re rolling the dice with potential oral disease. Cavities and gum disease are a common result! Healthy saliva provides a buffer between your teeth and plaque buildup as well as delivers essential minerals and nutrients to your teeth. • Simple things you can do to improve saliva flow and quality include: 💧 HYDRATE. Drink water throughout your entire day. 😴 MOUTH TAPE. During sleep, if your mouth is wide open, the dry mouth will lead to a morning of suboptimal saliva. 🚰 DON’T SKIMP ON MINERALS. If you drink a lot of filtered or distilled water, consider adding trace minerals to your water. Make sure to eat plenty of mineral-rich foods (calcium, magnesium, and phosphorus are a great place to start) to provide your saliva with tons of minerals for your teeth. 😋 CHEW GUM. Make sure it’s sugar-free and sweetened with xylitol. • Take a moment to sit still with your eyes closed and take note of your saliva. Is it thick? Thin? Metallic? Watery? Tell me in the comments below. ⬇

A post shared by Dr. Mark Burhenne (@askthedentist) on May 23, 2020 at 6:00am PDT

4. Supporting the Oral Microbiome

Your saliva is a key factor in a proper balance of good-to-bad microbes in your mouth.

The macromolecule proteins and mucins in saliva destroy, gather (aggregate), and/or cling to certain kinds of oral bacteria. Mucins, in particular, can stop bacteria from attaching to the surfaces inside your mouth and prevent those bacteria (or fungi) from colonizing in a specific area.

These functions help maintain the oral microbiome and preventing pathogens (cavity-causing, or “cariogenic” bacteria) from taking over the mouth.

5. Lubricating the Mouth

Saliva is a seromucous coating, which means it creates a barrier in your mouth between the oral mucosa and anything that enters your mouth. One of the most vital functions of saliva is the lubrication of these surfaces. 

By lubricating your mouth, saliva prevents your tongue, gums, cheeks, the floor of your mouth, and the roof of your mouth from being irritated.

Lubrication by saliva protects against:

• Proteolytic and hydrolytic enzymes in plaque (which can break down tooth enamel and lead to enamel erosion and tooth decay)
• Carcinogens from smoking and other chemicals you breathe in
• Dry mouth due to mouth breathing

Saliva is also what allows you to speak via lubrication of the oral mucosa.

6. Buffering Acids

Saliva not only gets rid of food debris that could feed bacteria that cause dental caries (tooth decay), it also buffers acids that can break down tooth enamel.

Compounds that help provide a buffer for teeth include:

• Bicarbonate
• Histidine-rich peptides
• Phosphate
• Urea
• Amphoteric proteins and enzymes

Bicarbonate, in particular, spreads into dental plaque and neutralizes acids. Bicarbonate also creates ammonia, which forms amines — an additional buffer to neutralize acids.

This buffering function of saliva is almost nonexistent when the flow rate of saliva is very low. This is also referred to as “unstimulated saliva”. 

A low salivary flow rate leads to the side effects of dry mouth (xerostomia), one of which is an increased risk of cavities.

7. Maintaining Strong Teeth

As part of defending teeth from cavities, saliva helps to maintain the strength of your teeth by supporting remineralization. 

Your teeth are remineralized and demineralized all day, every day. Good salivary flow and proper pH (6-7) allows saliva to deliver minerals to your teeth while protecting against acids breaking down enamel.

8. Identifying Systemic Health Issues

Salivary proteins and DNA in your saliva can identify potential disease risk or the presence of existing disease.

Conditions your saliva may predict or diagnose include:

• Oral cancer
• Head and neck cancer
• Viruses, including HIV
• Acne
• Allergies
• Fertility issues and problems conceiving
• Male-pattern baldness
• Chronic stress
• Cardiovascular concerns (high cholesterol and heart palpitations)
• Too-low body temperature
• Sleep disruptions
• Calcium absorption problems
• Premature aging

How Your Mouth Produces Saliva

Salivary glands produce and secrete saliva through cell clusters called acini. Acini secrete fluid that collects in ducts, where the balance of compounds in saliva is optimized. 

These small ducts in the salivary glands all channel into larger ducts and come together into a single duct. That one submandibular duct is what sends 90% of your spit into your mouth.

There are major salivary glands in each side of your mouth:

• Parotid gland (high in your cheek)
• Submandibular gland
• Sublingual gland

Without any outside factors, a small amount of saliva is produced at all times. Additional saliva is produced when:

• You taste and chew food
• You smell certain odors
• You take medications that impact saliva

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😯CLEAN Water’s DIRTY Secret . 🚰CLEAN water that’s been properly filtered to remove dangerous impurities is GREAT for hydrating your body (although #structuredwater is even better), but did you know that the processes to REMOVE the nasties can often leave your water lacking NECESSARY minerals that your body NEEDS to stay healthy- AND #remineralize your teeth? Minerals Like: Magnesium- its one of the MOST important minerals for a properly functioning body, and MOST people are deficient. It plays a role in 300-600 bodily functions and is involved in most metabolic pathways. For oral health, it helps bone and tooth structure but is ALSO believed to be beneficial at preventing #teethgrinding and improves the quality of #sleep. Of course, we know the two are connected but how #magnesium plays a role is not 100% clear other than it stimulated the parasympathetic nervous system. Boron- speeds up wound healing, which is key in #perio patients. Similar to how boron activates the osteoblasts in the bones, it also activates fibroblasts of the skin and tissues. So it’s great for remineralization as well as the bone that girdles the teeth (aka, bone loss). Phosphorus- essential for calcium to do its job in rebuilding tooth structure. No phosphorus = no calcium uptake by the teeth (NO WAY!). Zinc- may be the BIG sleeper for oral health, and more is being discovered EVERY DAY. I’m intrigued by its #oralmicrobiome influence. It’s KEY for enzyme pathways that enable the biome to do what it’s good at- keep all the good bugs in harmony, thus benefitting the host (YOU!) Calcium- Are you SURPRISED it’s on the bottom of my list? Well, most of us have enough. Yes, it’s a major substance in bone and teeth, but without ample vitamin D/K2, calcium ends up in your bloodstream where it doesn’t belong. So, what do I recommend? – Use a quality water filter, and add a few drops of trace minerals back to your glass. THIS way, you know you’re getting great water without the downside. Watch my stories today for some recommendations. QUIZ: Tell me your FAVORITE K2 food, and I’ll enter you in a drawing for my guide to prevent AND reverse cavities NATURALLY!

A post shared by Dr. Mark Burhenne (@askthedentist) on Jan 16, 2020 at 6:01am PST

How to Maintain Healthy Saliva

To keep your saliva healthy and producing at a high rate:

• Stay well-hydrated. Experts suggest drinking half your body weight in ounces of water every day. If you weigh 150 pounds, you should drink at least 75 ounces of water each day. Eat hydrating foods, too, like celery and watermelon.
• Address seasonal and household allergies to help encourage nasal breathing and avoid mouth breathing.
• Practice good oral hygiene, including teeth brushing, flossing, tongue scraping, and oil pulling.
• Chew erythritol or xylitol gum and/or mints. These sugar alcohols increase the amount of saliva you produce and may support tooth remineralization.
• Eat foods of different textures. Eating foods that require significant chewing encourages salivary flow.
• Mouth tape every night. Mouth breathing during sleep is one of the main drivers of dry mouth.
• Use artificial saliva products like Biotene gel, which provide moisture for people who simply can’t produce enough saliva. In severe cases, your dentist may be able to prescribe sprays to moisten the mouth.
• Avoid traditional mouthwash. Most mouthwash dries out the mouth and destroys the oral microbiome.
• Rinse with a diluted baking soda solution a few times per day. This may provide an additional buffer within the mouth and keep cavities under control.

Can saliva damage teeth? Technically, a lack of saliva can damage teeth. 

If you sleep with your mouth open, have a condition such as Sjogren’s syndrome, or take medications that cause dry mouth, you probably have low rate of saliva flow. Particularly at night, slow saliva flow will lead to cavities and potentially other issues like gum disease or sensitive teeth.