Laser in periodontitis: what it actually does
The word “laser” in dentistry has collected a lot of promises, so people expect either a miracle or a catch. The reality is plainer. In periodontitis a laser solves one specific problem: it destroys bacteria where instruments cannot reach — deep in the gum pocket and in the microscopic tubules of the root. It does not replace cleaning, it does not regrow bone and it does not treat periodontitis on its own. But what it does, it does well — and without antibiotics.
How it works: a dye and light
The method is called photodynamic therapy and it has two components, neither of which works alone.
First a dye solution — a photosensitiser — is placed into the pocket. It settles on bacterial membranes and stains them. Healthy gum cells barely retain it, and that is the key to its selectivity.
Then a thin light guide is placed into the pocket and a laser of a particular wavelength is switched on. The light itself is harmless. But once absorbed by the dye it triggers a reaction that releases active oxygen, and that destroys the bacterial membrane from inside.
The reaction happens only where the dye is. Surrounding tissue is neither heated nor damaged. That is why photodynamic therapy does not carry the list of restrictions that comes with cutting lasers.
One more detail matters: bacteria do not develop resistance to this mechanism the way they do to antibiotics. The course can be repeated as often as needed.
Why it does not replace cleaning
This is where disappointment usually comes from, so let me be direct: a laser does not work through calculus.
In periodontitis bacteria do not live individually but in a biofilm — a dense structure glued to the root and covered by calculus. Neither the dye nor the light passes through it. Shine a laser into an uncleaned pocket and the top layer dies while the colony underneath stays untouched and recovers within days.
So the sequence is always the same: first professional hygiene, removal of calculus above and below the gum, root surface debridement — and only then the laser, into an already clean pocket.
In that order it adds noticeably to the result of the cleaning. On its own it adds nothing.
Who it suits
We do not offer photodynamic therapy to everyone, only where it is of use.
Moderate pockets that do not close after cleaning. The classic situation: hygiene has been done, bleeding has decreased, but inflammation persists in a few areas.
When antibiotics are undesirable. Pregnancy, breastfeeding, intolerance, gastrointestinal problems, a recent course taken for another reason. Systemic antibiotics are not often prescribed in periodontitis, but where they would be, the laser becomes an alternative.
Maintenance therapy. For patients with a history of periodontitis, during scheduled reviews, in areas prone to flare-ups.
Inflammation around an implant. An implant surface must not be worked with metal instruments, so the choice of methods there is limited. Photodynamic therapy is one of them.
Before and after gum surgery. To operate on less inflamed tissue.
Who it does not suit: with deep pockets of six or seven millimetres and significant bone loss, the laser alone will not solve the problem. Surgery is needed there, and it is more honest to say so at once.
What a session is like
It is the calmest procedure we do in periodontics.
Anaesthetic is usually unnecessary — nothing is cut or drilled. The dye is placed into the pocket with a blunt cannula, left for a minute or two, and the excess is rinsed away. Then the light guide is inserted into each pocket in turn, roughly ten to thirty seconds each.
The sensation is warmth, or nothing at all. Patients more often say “I didn't notice when it started”.
A session on one segment takes fifteen to twenty minutes; a whole jaw takes longer. There are no restrictions afterwards: you can eat straight away and go back to work. The dye may tint the gum briefly; it rinses off.
A course is usually two or three sessions a week apart. A single session is rare: biofilm regrows in waves, and the repeat treatment catches what grew after the first.
Cost and what to expect
Photodynamic therapy (laser) — from UAH 3,350. It is a separate line in the price list, in addition to the cost of hygiene. The exact figure depends on the number of sites; the periodontist gives it after probing, when the map of pockets is clear.
Honestly about expectations.
What you will notice: less bleeding when brushing, less swelling, and bad breath disappearing if the pockets were its source. This shows within one to two weeks.
What the dentist will measure: pocket depth reduced by one to two millimetres in the treated areas at a review two to three months later.
What will not happen: bone will not regrow, exposed necks will not be covered, a mobile tooth will not become firm. Periodontitis is a chronic disease — it is brought into remission and held there, not cured for good.
And the thing without which none of the rest matters: the result rests on regular reviews and home care. The most expensive procedure loses to daily interdental cleaning.
Frequently asked questions
Does it hurt?
No. Nothing is cut and nothing heats up, so anaesthetic is usually unnecessary. At most there is a feeling of warmth in the gum.
Can the laser be used instead of cleaning?
No, and this is the method's most important limitation. Neither the dye nor the light passes through calculus. Hygiene first, laser second.
How many sessions are needed?
Usually two or three, a week apart. A single session gives a weaker and shorter result because the biofilm has time to recover.
Is it safe during pregnancy?
Yes, and that is one reason it is chosen: it is local, with no systemic medication. Timing and appropriateness are agreed with your doctor.
Will resistance develop, as with antibiotics?
No. The mechanism is physical — active oxygen destroys the bacterial membrane. Bacteria cannot develop resistance to that, so the course can be repeated.
Will it help with loose teeth?
No. Mobility means bone has been lost around the root, and a laser does not restore bone. It removes inflammation, and mobility may reduce slightly as swelling subsides — but that is not treating the cause.
Can it be used around an implant?
Yes. It is one of the few methods suitable for an implant surface, which must not be worked with metal instruments.
How soon is the result visible?
Bleeding and swelling decrease within one to two weeks. Pocket depth is measured at a review two to three months later — that is when the true tissue response can be seen.
22 years in practice (graduated from Dnipro Medical University in 1999). An evidence-based approach to hygiene and to treating the gums and periodontitis.
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The periodontist will probe the pockets and say whether you need the laser at all — or whether hygiene is enough. A consultation with a specialist costs UAH 690.
Or book by phone 067 478 88 78
Book a consultation with the periodontist
The periodontist will probe the pockets and say whether you need the laser at all — or whether hygiene is enough. A consultation with a specialist costs UAH 690.
Book now