Early cavity detection without X-rays: How a dentist-turned-scientist created a game-changing toothpick device
When it comes to detecting cavities early, traditional dental tools often fall short—especially in young children. But a new innovation from Dr. Gili Naveh, an orthodontist and associate professor at Tufts University School of Dental Medicine, is changing the game.
Her creation? A color-changing diagnostic toothpick that detects early-stage tooth decay by identifying acid-producing bacteria—without the need for X-rays.
From frustrated parents to a scientific solution
While treating young orthodontic patients, Dr. Naveh noticed a recurring concern: parents were overwhelmed by the number of cavities identified at each check-up, despite following strict oral hygiene guidelines.
This sparked a pivotal question: What if we could detect the earliest signs of decay at home—before the damage requires fillings?
Backed by a PhD in structural biology and advanced training in orthodontics, Dr. Naveh merged her clinical experience with scientific insight to develop a safe, simple, and low-cost cavity screening tool.
How the diagnostic toothpick works
The science behind the invention lies in oral pH balance. Cavities begin to form when tooth surface pH drops below 5.5, triggering enamel demineralization.
Here’s how the tool works:
- Patients chew a sugary gummy to simulate real-life sugar exposure.
- They then insert the CaviSense™ toothpick between teeth or near suspected problem areas.
- If the toothpick tip changes from purple to yellow, it signals the presence of acid strong enough to cause demineralization.
This visual cue allows dentists or parents to take action—through bacteria-targeting treatments or enamel-repair pastes—before decay progresses.
CaviSense: From lab to launch
The device, marketed under the brand name CaviSense, is now part of a Tufts University-affiliated startup co-founded by Dr. Naveh. In 2024, it was officially licensed for distribution and is already in use by some dental practices, mobile clinics, and available for home use via the company website.
“It’s cheap, it’s easy to use, and it’s very visual,” said Dr. Naveh in a university interview.
Award-winning innovation with a promising future
In recognition of her contribution, Dr. Naveh was named Tufts University’s Rising Innovator of the Year 2024. She was also honored for her first U.S. patent and licensing achievement during the fiscal year.
Looking ahead, her team is developing a more advanced version: a bite tray coated with the same color-sensitive formula, enabling simultaneous screening of all tooth surfaces. The launch is expected in mid-2025.
Saliva diagnostics on the rise
Dr. Naveh’s innovation aligns with a broader industry trend toward non-invasive, saliva-based diagnostics. Recent studies from Poland and Romania show a strong correlation between low salivary pH and dental caries in children—supporting the use of oral fluid as a reliable early detection tool.
The saliva diagnostics market, valued at over USD 818 million in 2024, is projected to grow due to:
- Public demand for radiation-free dental care
- Infant-friendly sampling innovations
- Industry support from giants like Thermo Fisher Scientific, with tools like the SpeciMAX® Stabilized Saliva Collection Kit
Dr. Gili Naveh’s work reflects a powerful combination of clinical empathy, scientific excellence, and innovative thinking. Her breakthrough is not just a tool—it’s a people-first solution poised to redefine preventive dentistry for patients of all ages.
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