Technology
How 625nm red and 470nm blue light work in the mouth, what the research has looked at, and why coverage decides everything.
The principle
Photobiomodulation, step by step.
Certain wavelengths of light are absorbed by your cells and change how they behave. In dentistry this has been studied for decades, first as low-level laser therapy and now as photobiomodulation. The mechanism is specific, it happens in a known place, and it can be described in four steps.
Light reaches the mitochondria
Your mitochondria contain an enzyme called cytochrome c oxidase, sitting at the end of the electron transport chain where cells generate ATP. It absorbs light strongly in the red range, roughly 600 to 700nm.
Nitric oxide is displaced
Under stress, nitric oxide binds to that enzyme and blocks oxygen from being used efficiently. Red light at 625nm displaces it, and mitochondrial respiration recovers.
ATP production increases
Increased ATP improves cellular function and helps balance reactive oxygen species, reducing oxidative stress in the tissue and supporting normal repair processes.
Blood flow improves
The released nitric oxide is a potent vasodilator. Local vessels widen, improving oxygen and nutrient delivery and clearing metabolic waste. Gum tissue is highly vascular, so this matters more here than in most places.
Two wavelengths
Different light, different job.
Gum problems have two components: a bacterial one and a tissue one. Heliored runs two wavelengths because addressing both is more complete than addressing either alone.
625nm
Red
The photobiomodulation wavelength. Absorbed by cytochrome c oxidase and well matched to gum tissue, which is thin and sits right at the surface.
Cellular energy, blood flow, and the tissue's own repair processes.
470nm
Blue
A completely different mechanism. Absorbed by porphyrins, pigments produced by bacteria including Porphyromonas gingivalis and Streptococcus mutans, generating reactive oxygen species inside the bacterial cell without harming surrounding tissue.
It is also the wavelength that activates the PAP in Helioblue.
625nm
Red light
470nm
Blue light
15 min
Per session, timed
3x
Minimum per week
Applications
What this means in your mouth.
Photobiomodulation has been studied across a range of oral applications, almost always as an adjunct to conventional dental care rather than a replacement for it.
Gum health and inflammation
Oral tissues contain mitochondria-rich cells that respond well to red light. Studies on periodontal cells have examined how red and near-infrared light influences inflammatory signalling, including the release of pro-inflammatory cytokines.
Research also suggests photobiomodulation can support fibroblast activity, which relates to collagen production and gum tissue repair. Clinical work alongside standard non-surgical periodontal treatment has reported improvements in bleeding measures.
TMJ disorders and jaw pain
Temporomandibular joint disorders often involve muscle inflammation and nerve pain. Photobiomodulation has been studied for its effect on pain and stiffness in this area, with proposed mechanisms including improved local circulation, muscle relaxation and lowered oxidative stress in the jaw.
It has also been examined for post-extraction recovery, including after wisdom teeth removal, and for orthodontic pain following adjustments.
Tooth sensitivity
Dentinal hypersensitivity is often linked to exposed dentinal tubules and inflamed nerve endings. Photobiomodulation has been studied in this context for its effects on nerve tissue and local inflammation, alongside appropriate dental treatment.
Separately, hydroxyapatite, the mineral used in our Helioblue applicator, has been studied for its role in enamel remineralisation and occluding those exposed tubules.
Bacterial biofilms
Studies suggest red light combined with antimicrobial blue light can help reduce oral bacterial biofilms, the structured communities of bacteria behind plaque, cavities and gum disease.
This has been explored in dental research as a potential adjunct to procedures including root canal disinfection, where photobiomodulation has also been studied for its effect on post-procedural pain and inflammation.
Breath and oral environment
Blue light at 470nm targets the porphyrin-producing bacteria associated with odour, which is why it has been studied in relation to breath freshness as well as plaque.
Recovery after dental work
Light therapy has been studied for tissue repair after procedures such as extractions and implant placement, and for aphthous ulcers, with proposed mechanisms including modulating bacterial load and reducing excessive inflammatory signalling.
From NASA research to dentistry
Photobiomodulation's modern research story runs partly through NASA, whose work on LED light and wound healing in the 1990s helped establish the field. That research was subsequently extended to oral tissues and gum regeneration.
Since then, numerous studies have explored low-level laser therapy in dentistry. The strongest clinical footing anywhere in medicine happens to be in the mouth: international clinical guidelines have recommended photobiomodulation for preventing oral mucositis, the severe ulceration of the mouth lining affecting patients undergoing chemotherapy and head and neck radiotherapy. A professional body recommending light therapy for a serious oral condition is a considerably higher bar than a wellness claim.
We go through the evidence properly in does red light therapy work for gums?
Why a mouthpiece
Coverage is the whole argument.
Light that does not reach a site does nothing for that site. It is the most underrated specification in this category, and it decides whether anything else on this page applies to you.
A handheld torch or an LED toothbrush lights whatever it happens to be pointed at. Your rear molars get a fraction of the exposure your front teeth do, and they are often where problems start.
An intraoral mouthpiece puts the LEDs millimetres from the tissue and treats the full arch at once, hands-free, for the whole session. No aiming, no holding, no guessing.
It is also why we do not use near-infrared. Its advantage is penetration depth, which solves the problem of a light source sitting outside your mouth. Move the light source inside and that problem is already solved.
Being straight with you
What it does not do
It does not remove plaque. Plaque is a physical biofilm and it comes off with a brush.
It does not regrow gum tissue that has already been lost, though it may help with the inflammation that drives further recession. More on that here.
And it does not replace your dentist. Photobiomodulation has been studied as an adjunct to conventional care, meaning alongside it. That is the role Heliored is built for.
Information on this page is for general educational and wellness purposes. It is not medical or dental advice. Heliored products are not intended to diagnose, treat, cure or prevent any disease. Persistent gum problems need professional dental assessment.