Dental laser: what is it really used for, and what are its limits?

Dental lasers in brief

A dental laser is an instrument that concentrates light into a beam of a specific wavelength. Depending on that wavelength, it acts mainly on soft tissue (gums, the lining of the mouth) or also on hard tissue (enamel, dentine, bone). It is mainly used for minor gum surgery, as an add-on to some gum treatments, to relieve certain mouth lesions and, with some devices, to remove decayed tissue.

It is one tool among others, not a technique that replaces everything. In many situations, conventional instruments (drill, curette, ultrasonic scaler, scalpel) give equivalent results, and the quality of treatment depends above all on the diagnosis and the clinician's skill.

This article describes lasers in general terms: what they can do, what the guidelines say, and the questions to ask if one is offered to you.

The different types of laser

There is not "one" laser but several families, each absorbed by different components of the tissues:

• Diode laser. Compact and very common, it is absorbed by pigments and haemoglobin. It works on soft tissue: gums, frenula, small lesions. It does not cut enamel or dentine.
• Nd:YAG laser. Also mainly for soft tissue, with deeper penetration, which requires precise control of the heat produced.
• Erbium lasers (Er:YAG, Er,Cr:YSGG). Absorbed by water, they can act on hard tissue: removing decayed tissue and preparing small cavities, as well as soft tissue and bone surgery.
• CO2 laser. Very effective on soft tissue, used mainly in surgery of the oral lining.
• Low-level lasers (photobiomodulation). These do not cut: they aim to modulate inflammation and pain, for example on some mouth ulcers or after surgery.

These differences explain why the same word covers very different uses, and why no single device does everything.

Recognised uses

The best-established indications concern soft tissue:

• gum surgery: reshaping gums that show too much or are overgrown, uncovering a tooth or an implant, usually with little bleeding during the procedure;
• frenectomy: releasing a lip or tongue tie, in children as well as adults;
• relief of painful lesions, such as some mouth ulcers or cold sores, through photobiomodulation;
• dentine hypersensitivity: some lasers can reduce sensitivity at the neck of the teeth, with results that vary between people and are sometimes temporary.

On hard tissue, erbium lasers can remove decayed tissue in small lesions, with less vibration and noise than a drill. They do not suit every situation: they are slower, unsuitable for removing old metal or ceramic restorations, and decay is treated very well without them. Our tooth decay treatment page describes the conventional approach, which remains the standard.

Lasers and gum disease: what the evidence says

This is probably the area where lasers are promoted most, and where the most caution is needed.

Treating periodontitis relies on removing biofilm and tartar above and below the gum line, with hand or ultrasonic instruments, combined with strict control of hygiene and risk factors (smoking, diabetes). That foundation is what makes the difference. Our article on periodontitis stages and treatment explains it in detail.

Lasers have been proposed as an adjunct to decontaminate gum pockets. Studies give inconsistent results, and the clinical practice guideline of the European Federation of Periodontology (EFP) published in 2020 does not support lasers as a routine adjunct to non-surgical treatment, as the benefit has not been sufficiently demonstrated. This does not mean they are useless in every case, but they can never replace careful root cleaning.

The same caution applies to peri-implantitis: a laser can be part of a decontamination protocol, but is not a solution on its own. For the full approach, see our gum treatment page.

Myths about dental lasers

Several claims circulate, particularly on social media. Let us sort them out:

• "Lasers are painless." They can reduce discomfort in some procedures, and certain minor treatments are done with little or no anaesthetic. But local anaesthesia is still often needed, especially on hard tissue or in surgery.
• "A laser cures gum disease on its own." No: without root cleaning and daily hygiene, the inflammation comes back.
• "Lasers replace the drill." Only in limited cases. For a large cavity or a crown, conventional instruments remain essential.
• "Laser whitening works better." Activation with light or a laser has not shown a clear, consistent advantage over whitening gel alone; what matters most is the product, its concentration and contact time.
• "Lasers heal better." On soft tissue, healing is often comfortable, but not necessarily faster than after a well-performed conventional procedure.

A well-indicated laser is a bonus. A laser used as a sales pitch guarantees nothing.

Safety, risks and precautions

Used correctly, dental lasers are safe, but they require strict rules:

• eye protection: patient, clinician and assistant wear glasses matched to the wavelength;
• heat control: unsuitable settings can burn the gum, the bone or the tooth's pulp;
• specific training for the clinician, as each type of laser has its own parameters;
• particular precautions with a suspicious lesion of the oral lining: a tissue sample for analysis (biopsy) must be taken in a way that does not damage the tissue to be examined.

After laser treatment on the gums, recovery is usually straightforward: mild tenderness, a whitish look to the area as it heals, gentle hygiene and lukewarm food for the first few days. Your dentist will give you the precautions specific to your procedure.

If your teeth are sensitive to cold, it helps to understand the cause before considering a laser: our article on tooth sensitivity explains the options.

Do you need a laser for your treatment? An assessment in Rabat

The right question is not "does the practice have a laser?" but "which treatment best suits my situation, and on what evidence?". If you are offered laser treatment, a few questions will help you see clearly:

• which type of laser, and for what specific purpose?
• what benefit can I expect compared with the conventional technique?
• is the basic treatment (cleaning, treating the decay) planned alongside it?
• what is the recovery like, and what are the alternatives?

At German Dental Clinic in Agdal, gum care, scaling and the treatment of decay rely on validated conventional techniques, preceded by an examination and digital X-rays where needed. If laser treatment interests you, the dentist will tell you whether it would be of benefit in your case and which options to consider. If you live in Rabat and would like your gums or a sensitive tooth checked, you can book an appointment.