Light Colours for Teeth Whitening

Teeth whitening treatments often use different light colors to enhance the effectiveness of the whitening agents. Each light color has specific benefits and applications in the whitening process. Here are the primary light colors used in teeth whitening and their benefits:

Blue Light (460-490nm)


  1. Accelerates Whitening: Blue light activates the hydrogen peroxide or carbamide peroxide in whitening gels, speeding up the chemical reaction that removes stains.
  2. Deep Penetration: The wavelength of blue light allows it to penetrate deep into the enamel, effectively breaking down stains.
  3. Reduced Sensitivity: Blue light is less likely to cause tooth sensitivity compared to other methods, making it a popular choice for patients with sensitive teeth.
  4. Effective for Surface Stains: Particularly effective in removing surface stains from coffee, tea, red wine, and tobacco.

Red Light (620-625nm)


  1. Reduces Inflammation: Red light therapy can help reduce gum inflammation and promote healing, making it beneficial for patients with gum sensitivity or minor oral injuries.
  2. Enhances Comfort: Red light can help soothe the gums and surrounding tissues, providing a more comfortable whitening experience.
  3. Anti-bacterial Properties: Red light can help reduce bacterial load in the mouth, contributing to overall oral health.

Purple Light (Combination of Blue and Red Light, 405-410nm)


  1. Comprehensive Whitening: Combines the benefits of blue and red light to provide a thorough whitening treatment that addresses both deep and surface stains.
  2. Dual Function: Purple light can simultaneously activate the whitening gel and soothe the gums, making the treatment more effective and comfortable.
  3. Enhanced Penetration: The combination of wavelengths can enhance the penetration of the whitening agents, leading to more uniform and significant results.

Ultraviolet (UV) Light


  1. Highly Effective: UV light can significantly accelerate the whitening process, producing fast results.
  2. Deep Whitening: Penetrates deeply into the enamel and dentin, effectively breaking down complex stains.
  3. Professional Use: Typically used in professional settings due to its high intensity and potential risks if not used correctly.

Green Light (Rarely Used)


  1. Balanced Approach: Sometimes used in combination with blue light to balance the activation process of the whitening gel.
  2. Unique Penetration: Different wavelength properties can help in addressing specific types of stains.

General Benefits of Light-Activated Teeth Whitening:

  1. Faster Results: Light activation significantly speeds up the whitening process, often achieving results in one session that might take weeks with at-home treatments.
  2. Enhanced Effectiveness: Light activation can make whitening agents more effective, leading to whiter teeth.
  3. Customizable Treatments: Different light intensities and colors allow for treatments tailored to the patient’s specific needs and sensitivities.
  4. Reduced Sensitivity: Many light-activated systems are designed to minimize sensitivity, making the experience more comfortable for the patient.

Using these various light colors, dental professionals can provide tailored, effective, and comfortable teeth whitening treatments, ensuring optimal results for their patients.