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Comparing Diode Laser (660 nm) & 8% Arginine Toothpaste vs. Laser Alone for Dentin Hypersensitivity: A Randomized

Simran Genescia¹, Neetha J Shetty¹

¹Department of Periodontology, Manipal College of Dental Sciences Mangalore, Manipal Academy of Higher Education, Manipal, Karnataka, India.

Journal of Lasers in Medical Sciences

|March 6, 2026

Summary

Combining a 660 nm diode laser with 8% arginine toothpaste effectively manages dentinal hypersensitivity (DH). This combination therapy offers immediate and lasting relief by modulating nerve response and occluding dentinal tubules, outperforming laser therapy alone.

Keywords:

Arginine-containing toothpaste Dentin hypersensitivity Desensitizing toothpaste Laser Tubule occlusion

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Area of Science:

Dentistry
Biomedical Engineering
Laser Therapy

Background:

Dentinal hypersensitivity (DH) affects a significant patient population.
Conventional treatments for DH include desensitizing agents and laser therapy, with varying efficacy.
A need exists for enhanced DH management strategies with sustained relief.

Purpose of the Study:

To evaluate the effectiveness of a 660 nm diode laser combined with 8% arginine toothpaste for DH.
To compare the combination therapy against diode laser therapy used alone.
To assess the immediate and sustained reduction in dentinal hypersensitivity.

Main Methods:

A randomized study involving 12 patients with severe DH.
Teeth were treated with either 660 nm diode laser + 8% arginine toothpaste (Test) or 660 nm diode laser alone (Control).
Laser irradiation parameters: 25 mW, 60 seconds, 1 cm², continuous mode, LLLT (8 mm). DH scores assessed via VAS and SCASS at baseline, 15 minutes, and days 15 and 30.

Main Results:

The combination therapy demonstrated a significant and sustained reduction in Visual Analogue Scale (VAS) and Schiff Cold Air Sensitivity Scale (SCASS) scores.
Reductions were observed at 15 minutes post-application and persisted through days 15 and 30.
The test group showed superior results compared to the control group (laser alone), with P < 0.05 indicating statistical significance.

Conclusions:

Adjunctive use of 660 nm diode laser with 8% arginine toothpaste is a promising treatment for DH.
This combination therapy provides immediate and sustained DH relief through dual mechanisms: laser-induced nerve modulation and arginine-mediated tubule occlusion.
The findings suggest this approach may be more effective than standard desensitizing toothpaste or monotherapy with laser alone.