Many people assume a dental laser is a painless replacement for the drill. The research paints a narrower picture. Lasers can make some gum procedures bleed less and can reduce the need for anaesthetic when removing decay, but they are slower, they suit only certain jobs, and for most everyday dentistry conventional instruments remain the standard.
Light, tuned to a particular tissue
A dental laser sends out light at a single wavelength. Each tissue in the mouth absorbs some wavelengths strongly and others weakly, depending on how much water, pigment or mineral it contains. Where the light is absorbed, it turns into heat, which lets the clinician cut, vaporise or reshape a thin layer of tissue. In soft tissue that heat also seals small blood vessels, which is why laser work on gums tends to be tidier than a scalpel.
Because absorption depends on wavelength, one laser rarely does everything. A unit that works well on gum may barely touch enamel, and a laser designed for hard tissue behaves differently again.
Four families of laser you may hear about
| Laser | Tissue it suits | Typical tasks |
|---|---|---|
| Diode | Soft tissue | Minor gum reshaping, small soft-tissue procedures, some sensitivity treatment |
| Erbium (Er:YAG and similar) | Hard and soft tissue | Removing decay, preparing cavities, some gum treatment |
| Nd:YAG | Soft tissue | Gum pocket treatment alongside cleaning |
| CO2 | Soft tissue | Precise soft-tissue surgery |
Erbium lasers are the ones most studied on teeth themselves, because their wavelength is absorbed by the water and mineral in enamel and dentine. Diode lasers are small and common for soft-tissue work.
Removing decay: fewer injections, more time
A 2025 meta-analysis in the Journal of Dentistry (Esteves-Oliveira and colleagues) pooled 20 clinical studies comparing laser and conventional drills for removing decay. Fewer patients needed local anaesthetic and patients reported less pain when a laser was used. Restoration survival and the health of the tooth's nerve were not significantly different between the two. The catch was time: laser preparation took noticeably longer, and the authors rated much of the evidence as low or very low in quality.
In practice, that means a laser may suit a small cavity in a patient who strongly dislikes injections, while a large filling, a cavity between teeth, or the replacement of an old metal filling or crown still needs conventional instruments.
Gum treatment: a small extra, not a substitute
The foundation of gum disease treatment is thorough cleaning above and below the gum line, often called scaling and root planing, followed by good home care and regular maintenance. Our article on deep cleaning and root planing explains that process.
Lasers are sometimes used alongside that cleaning. A 2026 meta-analysis in Lasers in Medical Science (Sunar and colleagues) found that laser-assisted therapy may give a small additional benefit over cleaning alone. Erbium lasers showed the most consistent effect, but it was clinically limited, and the authors suggested lasers be seen as a supplement rather than a routine add-on.
Lasers can also be used to reshape gum tissue, for example to even out a gum line or expose more of a tooth before a crown. The conventional version of that procedure is described in our crown lengthening guide.
Sensitive teeth: one option among several
Laser treatment is one way to reduce sensitivity from exposed dentine, alongside desensitising toothpastes, varnishes and other topical agents. A 2025 meta-analysis in Clinical Oral Investigations (Chen and colleagues) concluded there was not enough evidence to say whether lasers or topical agents work better, and rated the evidence as very low in quality. If sensitivity is your main concern, our guide to sensitive teeth causes and treatment covers the full range of options and the causes worth ruling out first.
What a laser cannot do
A laser does not diagnose anything, so it does not replace X-rays or a clinical examination. It is not used for routine scale and clean appointments, and it cannot remove crowns or old metal fillings. Not every practice has every type of laser, and the training and settings matter as much as the machine.
Safety depends on correct use. Everyone in the room wears protective eyewear matched to the laser's wavelength, and the clinician chooses settings for the tissue being treated.
Questions we are often asked
Does laser treatment hurt less?
For decay removal, studies suggest patients report less pain and fewer need an injection, although the evidence is not strong. For gum work, many people find it comfortable, but it still depends on the procedure and the person.
Will a laser cure gum disease?
No tool cures gum disease on its own. Cleaning, home care and regular maintenance visits do most of the work. A laser may add a small benefit in some cases.
Is laser dentistry more expensive?
It varies a great deal by procedure and practice, and laser treatment often takes longer. A written treatment plan with fees for your specific treatment is the most reliable guide.
Talk it through before choosing
If you are curious whether a laser could help with a particular problem, ask your dentist or OHT what the options are, how long each takes and what the evidence shows for your situation. The team at Lumi Dental is happy to explain the choices at your next visit, and you can see our current offers on the current deals page.
This article is general information and not a substitute for personalised advice from your dentist.
