From Cavities and Bad Breath to Dementia? Real Health Habits That Start in the Mouth

Oral health is often thought of as being 'just for protecting teeth and preventing cavities or gum disease,' but it is actually a crucial key closely linked to the health of the brain and the entire body. Dr. Andrew Huberman, a neurobiologist at Stanford University School of Medicine, hosted functional dentist Dr. Staci Whitman on his podcast, 'Huberman Lab,' to discuss in depth how the oral microbiome affects the brain, cardiovascular system, hormonal status, and overall health. Based on that discussion, this article explains the basics of oral care and the oral microbiome, as well as concrete ways to improve them.

1. The Deep Connection Between Oral Environment and Systemic Health

1-1. Why is the mouth called the 'gateway to the body'?

We often hear the expression that the mouth is the 'gateway' for food intake, but more accurately, it can be considered part of the gastrointestinal tract. Food and drink enter the mouth first, where initial digestion begins, and saliva contains a variety of components such as digestive enzymes, immune cells, and hormones. This complex environment forms the oral microbiome, which influences not only the health of teeth and gums but also systemic immune status and metabolic function.

1-2. Oral Biofilm and Disease Risk

A wide variety of commensal bacteria live on the teeth and gums, forming a biofilm (commonly known as plaque). This is not necessarily 'bad'; in fact, a healthy biofilm is important for protecting teeth and mucous membranes. However, due to poor diet or the abuse of excessive antiseptic products (such as alcohol-based mouthwash), beneficial bacteria can be lost and pathogenic bacteria can increase. This is thought to raise the risk of not only cavities and gum disease but also cardiovascular disease, dementia, and autoimmune diseases.

2. First, Basic Oral Care: Tips for Brushing and Flossing

2-1. Is just brushing enough?

Many people think of 'brushing with a toothbrush' as oral care, but there are many areas that a brush cannot reach sufficiently, such as between the teeth and along the gum line. Therefore, it is recommended to use dental floss or a water flosser (oral irrigator) in combination.

• Toothbrush: Use a soft-bristled brush and brush for about 2 minutes using light circular motions, rather than scrubbing hard.

• Dental floss: Even if only at night, floss before brushing to remove plaque and food debris between teeth (using a C-shaped motion).

• Water flosser: Effective for washing away debris that floss alone cannot remove, such as in periodontal pockets or around bridges and orthodontic appliances.

2-2. Be careful about brushing immediately after eating

It is best to wait about 20 to 30 minutes after a meal before brushing. Immediately after eating, the oral pH becomes acidic, and tooth enamel temporarily undergoes demineralization (a state where minerals are easily lost), so brushing immediately at this time may risk scrubbing away the enamel.

3. Thinking About the Oral Microbiome Through Nutrition and Lifestyle

3-1. Diet: Cut back on ultra-processed foods and sugar

Sugar is not the only enemy of teeth and gums. Refined grains (flour) like crackers and chips are also easily fermented in the mouth just like sugar, making them prone to producing acid, so be careful. Also, in modern times, the habit of 'grazing' often keeps the mouth in an acidic state, preventing saliva from functioning properly for remineralization (tooth repair).

• Ideal diet: Centered on 'whole foods' such as high-quality protein, vegetables, fruits, nuts, and fermented foods.

• Reduce snacking: If snacking is absolutely necessary, try using natural xylitol gum to stimulate saliva production.

3-2. The Importance of Nasal Breathing and the Risks of Mouth Breathing

Mouth breathing dries out the oral cavity, shifts the pH to an acidic state, and increases the risk of cavities and periodontal disease. It is also pointed out that it can lower oxygen intake and sleep quality, potentially affecting cognitive function. As a countermeasure, try to be conscious of nasal breathing during daytime exercise, and consider using tape to gently keep your mouth closed while sleeping.

• In children, structural issues such as enlarged adenoids, rhinitis, or a narrow jaw may be the cause of mouth breathing, so early dental intervention is recommended.

4. The Debate Surrounding Fluoride and Hydroxyapatite

4-1. The Pros and Cons of Fluoridation

The idea that fluoride strengthens teeth has long been believed in the dental community, but in recent years, research suggesting "risks to the brain, hormonal system, bones, and thyroid" has increased, leading to intense debate over the validity of adding fluoride to tap water. It is a fact that while fluoride strengthens the tooth surface, it is also toxic at high concentrations.

4-2. The Rise of Hydroxyapatite Toothpaste

Recently, toothpaste containing hydroxyapatite has been gaining attention. Because it contains the same minerals as the main component of teeth, it is expected to have the effect of strengthening teeth while naturally promoting remineralization. It is gaining support from people who are resistant to fluoride and those who prioritize biocompatibility.

5. Daily Practical Techniques: Oil Pulling and Tongue Scrapers

5-1. Oil Pulling

Oil pulling, where you hold coconut oil or sesame oil in your mouth and swish it around for 10 to 20 minutes, is a traditional health practice derived from Ayurveda. While it is expected to help remove plaque, improve bad breath, and promote saliva secretion, it is recommended to limit it to a few times a week so that the strong antibacterial properties of the oil do not reduce beneficial bacteria too much.

5-2. Tongue Scrapers

A tongue scraper is a tool used to gently scrape the tongue to remove the white coating (tongue coating) and bacteria that accumulate on the surface. By efficiently removing dirt from the back of the tongue that cannot be fully removed with a toothbrush, it can lead to the prevention of bad breath and an improvement in the sense of taste.

6. Women's Life Stages and Oral Care

During periods of hormonal change, such as pregnancy and menopause, women are more prone to gum inflammation and dry mouth. In particular, pregnancy gingivitis occurs frequently in 50-70% of cases, and data has been reported that as periodontal disease progresses, it increases the risk of premature birth and low birth weight infants. It is important to visit the dentist and perform thorough care more than usual.

Oral care is by no means just a matter of "making teeth look white." It is an important habit that influences a wide range of health factors, including brain function, heart and blood vessels, hormonal balance, and immune strength. The key points are summarized as follows.

• Diet: Avoid ultra-processed foods, sugar, and flour, and focus on whole foods.

• Breathing: Avoid mouth breathing as much as possible and be conscious of nasal breathing. Consider measures for nasal breathing during sleep and examinations of oral structure.

• Brushing and Flossing: Brush gently for two minutes morning and night, and use floss or a water pick for the spaces between your teeth.

• Choosing Toothpaste: Decide for yourself whether to use fluoride, and consider hydroxyapatite-based options as an alternative.

• Additional Care: Oil pulling a few times a week and using a tongue scraper to remove tongue coating for extra cleanliness and bad breath prevention.

• Regular Checkups: Even if you have no symptoms, visit the dentist once or twice a year for a comprehensive oral checkup.

Small daily adjustments and changes in awareness can lead not only to future dental health but also to the prevention of systemic diseases and an improved quality of life. Please take this opportunity to review your own oral care.

Related Articles