Frequently Asked Questions

Most people think of dental work as maintenance. You get a cavity filled because it hurts. You get a crown because the dentist said you need one. It feels like fixing a problem — not doing anything that actually matters for your health long-term.

A large-scale Japanese study published in 2024 says otherwise. And the specific finding that matters most is one you probably haven't heard.

What did the study actually find?

Researchers at Osaka Metropolitan University analysed dental checkup records from 190,282 adults aged 75 and older in Osaka Prefecture, Japan. They tracked these individuals over a median period of 3.4 years, matching dental condition data against mortality records.

Three findings stood out:

• Adults with no remaining teeth were 1.7 times more likely to die from any cause compared to those who had 21 or more teeth.
• The combination of sound and filled teeth predicted mortality more accurately than counting sound teeth alone. In other words, a tooth that's been treated with a filling or crown still counts as a protective tooth.
• Untreated cavities increased risk. It wasn't just about having teeth — it was about whether those teeth had been looked after.

(Source: OHSAKA Study, Osaka Metropolitan University & University of Osaka, published December 2024. Peer-reviewed cohort study using Japan's National Health Insurance Database.)

Why treated teeth matter more than you'd think

This is the part that changes the equation.

Previous research had already established a link between tooth count and mortality. Fewer teeth, higher risk. That's been known for years. But this study went further. It looked at what condition those teeth were in.

And what it found is that a tooth with a filling or a crown — a tooth that a dentist has treated and restored — sits in the same protective category as a perfectly healthy natural tooth.

Think about what that means practically. That root canal you've been postponing? If the tooth gets treated, it stays in the protective column. If you ignore it until it needs extraction, it moves to the other column.

That old filling your dentist said should be replaced with a crown? Same logic. Keeping the tooth functional and treated keeps it working for you.

How does losing teeth actually affect health?

The study didn't isolate a single mechanism, but the medical literature points to several overlapping factors:

• Nutrition. Fewer functional teeth means reduced chewing ability. That leads to softer, often less nutritious diets — less fibre, less protein, more processed food. Over years, that adds up.
• Chronic inflammation. Untreated gum disease and decaying teeth maintain a low-grade inflammatory state. Chronic inflammation is linked to cardiovascular disease, diabetes complications, and cognitive decline.
• Aspiration risk. In elderly adults, poor oral hygiene is a documented risk factor for aspiration pneumonia — one of the leading causes of death in people over 75.
• Systemic bacterial load. An untreated oral infection doesn't stay in the mouth. Bacteria enter the bloodstream through inflamed gum tissue, contributing to endocarditis and other systemic conditions.

None of these are dramatic single-event risks. They're slow, compounding disadvantages that accumulate over decades. Which is exactly why they're easy to ignore — and exactly why the data is so striking when you look at it across 190,000 people.

What should you actually do about this?

The study's practical takeaway is straightforward. You don't need to have perfect teeth. You need teeth that are looked after.

That means three things:

• Get the work done that's been recommended. If your dentist told you six months ago that a tooth needs a crown or a filling needs replacing, that's not cosmetic advice. Every treated tooth stays in the protective column. Every ignored problem moves the odds the wrong way.
• Don't skip checkups. A separate arm of the same OHSAKA research programme found that elderly adults who skipped dental checkups had 1.5 times higher mortality risk than those who attended regularly. Catching problems early is the entire mechanism.
• Replace teeth that are already missing. Dental implants and bridges don't just fill a gap cosmetically. They restore chewing function, prevent adjacent teeth from shifting, and maintain jawbone density. The goal is functional teeth, however you get there.

Where your teeth stand right now

If you've been meaning to get a checkup, a filling replaced, or a recommendation followed up on — this is a good reason to stop postponing.

Kondapur (Hyderabad): Dr. Varsha can assess your current dental health, identify anything that needs attention, and give you a clear picture of where each tooth stands. Book your checkup at our Kondapur clinic or call +91-XXX-XXX-XXXX.

Visakhapatnam: Dr. Rajesh Kumar Y, with 29 years of clinical experience, offers the same thorough assessment at our Vizag clinic. Book your checkup or call +91-XXX-XXX-XXXX.

A checkup takes less than an hour. The study tracked outcomes over years.