Dr. Owen John

25/08/2025

Scientists have discovered a natural way to lower blood pressure—without pills and without side effects.

Drinking beetroot juice has been shown to reduce blood pressure in older adults. What makes it special is not only its nutrients, but the way it changes the bacteria in our mouth.

Researchers at the University of Exeter studied people in their 60s and 70s who drank nitrate-rich beetroot juice twice a day for two weeks. The results were striking—their blood pressure dropped significantly.

The juice also shifted the oral microbiome. It reduced harmful bacteria and boosted the good ones, helping the body turn dietary nitrate into nitric oxide. This compound is vital for keeping blood vessels healthy and flexible.

Interestingly, younger participants didn’t see the same effect. That’s likely because nitric oxide levels naturally decline with age, which makes older adults more responsive to nitrate-rich diets.

Beetroot is not the only source. Spinach, celery, and fennel also contain high levels of dietary nitrate. Including these foods may offer a safe and natural way to support heart and blood vessel health.

This research highlights how simple changes in diet could help reduce the risk of heart disease and stroke, offering a powerful tool for healthier aging.

🔬Source: Vanhatalo, A. et al. Ageing modifies the oral microbiome, nitric oxide bioavailability and vascular responses to dietary nitrate supplementation. Free Radical Biology and Medicine, July 3, 2025.

25/08/2025

25/08/2025

🦠Did you know cavities can be contagious?🦷

Cavities aren’t just about sugar. They’re caused by bacteria. And yes — those bacteria can actually spread from one person to another.

Everyday habits like kissing, sharing spoons, straws, or even putting a baby’s pacifier in the mouth can pass cavity-causing bacteria. The main culprit is Streptococcus mutans, which stick to teeth and produces acids that damage enamel.

Saliva is full of bacteria — some good, some harmful. When two people share saliva, the cavity-causing bacteria hitch a ride in those tiny droplets. Once they reach a new mouth, they attach to the tooth surface, especially where plaque already exists. If sugars are present, these bacteria quickly start producing acid, which weakens enamel and leads to cavities over time.

👶 Babies and young children are most vulnerable. Their teeth are still developing, and once these bacteria settle in, the risk of early cavities skyrockets. That’s why parents with untreated tooth decay often see their kids struggle with cavities too.

😬 Adults can spread it as well, but strong habits like daily brushing, flossing, less sugar, and regular dental visits make a big difference. The bacteria may transfer — but they don’t stand a chance if your mouth is protected.

25/08/2025

21/08/2025

When people hear “dental X-ray,” many imagine a heavy dose of radiation — but the reality is surprisingly different. Dental X-rays expose you to such a tiny amount that it’s almost the same as what you naturally get from everyday life. For perspective: eating a few bananas (which contain natural potassium radiation) gives you about the same dose as one dental X-ray. A few minutes of sunshine can expose you to even more. And a short airplane trip? That gives you several times more radiation than an entire set of dental X-rays.

Thanks to modern digital technology, today’s dental X-rays are safer and sharper than ever. Digital sensors have reduced radiation exposure by up to 90% compared to old film-based methods, while also giving dentists clearer, more precise images. That means better early detection, smarter treatment planning, and healthier outcomes.

Your safety is always a priority: dentists use lead aprons, thyroid collars, and follow the ALARA principle — “As Low As Reasonably Achievable.” This ensures that X-rays are only taken when there is a true medical benefit, never as a routine formality.

The bottom line: dental X-rays are not something to fear. They deliver only a minimal amount of radiation, are highly controlled, and play a crucial role in protecting your oral and overall health.

Disclaimer: This information is for educational purposes only and should not replace professional medical advice.

21/08/2025

20/08/2025

In Germany, a Bengal tigress named Cara received a gold tooth after breaking one while chewing toys at the Tierart sanctuary, where she’s lived since 2015. The injury caused severe pain and infection risk, prompting intervention by veterinary dentists from Denmark and Austria.

The procedure had two stages: first, a mold of the damaged tooth was taken; then a gold dental crown was fitted using special adhesive and UV light. Gold was chosen for its chemical resistance and durability.

Three weeks later, Cara resumed chewing without pain and fully adapted to her new tooth.

18/08/2025

Researchers at King’s College London have developed a keratin-based toothpaste made from human hair, skin, or wool that can restore enamel, halt early decay, and ease sensitivity.

Keratin bonds with minerals in saliva to form a crystal-like enamel coating, sealing exposed nerves and protecting teeth.

In lab tests, it outperformed fluoride by delivering structural protection and symptom relief. The protein is sustainably sourced from biological waste, avoiding toxic dental resins.

The technology could be available in toothpaste or gel form within two to three years, offering a natural, eco-friendly alternative for dental repair.

12/08/2025

11/08/2025

27/07/2025

Cavities can be contagious because the bacteria that cause them, especially Streptococcus mutans, spread through saliva. When people kiss, share utensils, cups, or even taste each other’s food, these bacteria can pass from one person to another. Once in the mouth, the bacteria feed on sugars and starches, producing acids that slowly wear down tooth enamel and cause cavities. This is especially important for children, who are more likely to get tooth decay during the early stages of their teeth developing.

To lower the chance of spreading these harmful bacteria, it’s best to avoid sharing eating utensils, cups, or straws. Parents should be careful about kissing children on the lips if they have cavities. Good habits like brushing and flossing daily, cleaning pacifiers and toys properly, and limiting sugary foods and drinks are also key to keeping teeth healthy.

Taking these simple steps can help stop the spread of cavity-causing bacteria and keep your smile strong.