Red & Blue Light Therapy: What It Really Does for Your Smile

LED light therapy has become increasingly popular in at-home teeth whitening but what does red and blue light actually do, and how much does it really matter?

At Polished London, we believe in transparency. Whitening results come from formulation first. LED is designed to support the process not replace it.

Here’s what you need to know.

What Is LED Light Therapy?

LED (light-emitting diode) therapy uses specific wavelengths of light to support different biological processes.

 In oral care, red and blue light are most commonly used alongside whitening formulas to help optimise results and comfort.

It’s important to understand that light alone does not whiten teeth. The whitening results come from the active whitening ingredients in the formula and the LED enhances the performance and speeds up the whitening process

What Does Blue Light Do?

Blue light is primarily associated with whitening activation.

When used alongside a peroxide-free whitening formula, blue light can help:

• Support the breakdown of surface stains
• Enhance the performance of whitening ingredients 
• Encourage better results without increasing the sensitivity

However, without an effective formula, blue light on its own won’t change tooth colour.

What Does Red Light Do?

Red light is known for it's soothing and supportive benefits, particularly for gums.

In oral care, red light can help:

• Help soothe the gums during treatments
• Support circulation and oral comfort
• Balance the whitening process for sensitive users

This makes the red light particularly beneficial for those with sensitive teeth or gums, or anyone looking for a gentler whitening experience. 

Real whitening results come from formulation.

LED technology is designed to support, not substitute, high-quality whitening ingredients. 

That’s why Polished London focuses on:

• Clinically considered, peroxide-free formulations
• Enamel-respecting ingredients
• Whitening that works without unnecessary irritation

So, where does LED light therapy fit?

If you’re using a well-designed whitening system, LED can:

• Enhance the experience
• Support comfort
• Complement the formula

But whitening should never rely on light alone.

The Polished London Approach

All Polished London, we believe in effective whitening. 

All our formulas are clinically proven, UK made, and developed with dentists, using peroxide=free, enamel respecting ingredients. LED technology is designed to support the process, but real whitening results come from the formulation itself. 

Because when it comes to your smile, results shouldn't rely on gimmicks. it should rely on science.