A Wasabi-Derived Treatment That Regenerates Tooth Tissue Is Moving Into Human Trials

A wasabi compound regenerated dentin in rats. Researchers are now testing it in people.

A big bite of wasabi can wreak havoc on your sinuses, but it might soon do something considerably more impressive: help damaged teeth repair themselves.

Researchers in Japan have discovered that a natural compound found in Japanese wasabi can push tooth-forming cells to build new dentin, the mineralized tissue beneath enamel. Dentin doesn’t naturally regenerate, but the treatment promises to change that. After success in rat tests, the team has now moved the approach into early human clinical testing at Tokyo Dental College, where researchers are investigating whether the compound can reduce painful tooth sensitivity.

A wasabi molecule that makes teeth build new tissue

The story began with a complex molecule called 6-methylsulfinylhexyl isothiocyanate, mercifully shortened to 6-MSITC.

This molecule occurs naturally in Japanese wasabi, where it seems to exhibit antimicrobial, antioxidant, and antiplatelet activities. But this isn’t the same chemical primarily responsible for the familiar blast of pungency in wasabi.

Professor Yoshiyuki Shibukawa and colleagues at Tokyo Dental College became interested in the compound while studying odontoblasts. These are the specialized, columnar biological cells that form the outer surface of the dental pulp and create dentin.

Dentin makes up most of a tooth. Enamel forms the extremely hard outer shell, while dentin sits underneath it, surrounding the soft dental pulp that contains nerves and blood vessels. When a tooth suffers mild damage, surviving odontoblasts can lay down additional material known as reactionary dentin. Think of it as the tooth reinforcing a vulnerable wall from the inside.

The Japanese researchers wondered whether they could deliberately accelerate that process. Their experiments, published in The Journal of Physiology in February 2026, suggest they can.

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When the researchers exposed cultured odontoblasts to 6-MSITC, the cells increased mineral production. The team then tried to understand how that was happening, and found that the compound alters the movement of several electrically charged particles, or ions, through odontoblasts.

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The molecular details are complex, but in the end, 6-MSITC helps create an environment rich in calcium and favorable to building mineralized dentin.

The researchers conducted another experiment, drilling small cavities into the molars of rats without reaching the pulp. They gen placed a gel containing 6-MSITC on some of the exposed dentin and saline on control teeth.

Two weeks later, the difference was substantial.

The treated teeth had formed nearly three times as much reactionary dentin as the untreated controls — about 260 micrometers compared with 92 micrometers.

It was a small experiment, with only a few animals, but it was enough to convince researchers to test the technology in humans.

Now the experiment is moving into human mouths

Tokyo Dental College researchers are conducting clinical testing in people at Suidobashi Hospital in Tokyo.

According to Science Japan, participants have been given chewing gum containing 6-MSITC, with researchers investigating whether stimulating new dentin formation can protect sensitive teeth and reduce pain. Some participants have reportedly become more comfortable with cold foods and drinks, but these results remain preliminary. The team has not yet published peer-reviewed clinical results, and key details such as the number of participants and the size of the effect have not been publicly reported.

The goal isn’t to regrow entire teeth with wasabi. The treatment is designed to regenerate dentin inside an existing tooth, not replace enamel, roots or a missing tooth. But the approach differs from conventional desensitizing treatments, which generally try to block microscopic channels in exposed dentin or reduce nerve signaling. Instead, the Japanese team hopes to encourage the tooth to repair itself by making more dentin.

Still, moving from cultured cells to damaged rat teeth and now to human testing is an important step. If larger clinical studies show that the treatment is both safe and effective, 6-MSITC (or drugs inspired by it) could eventually offer dentists a way to stimulate the tooth’s own repair machinery rather than simply covering up the damage.