What Is Dental Ozone Therapy?

Ozone (O₃) is an unstable, highly reactive form of oxygen — three oxygen atoms bonded together rather than the stable two-atom molecule we breathe. Its instability is its antimicrobial mechanism: it readily donates its third oxygen atom to oxidize the cell membranes and proteins of microorganisms. The same chemistry acts on human tissue — 21 CFR 801.415 records that ozone works as a germicide only at concentrations far greater than people can safely tolerate, which is why dental delivery is confined to the treatment site and evacuated.

Medical-grade ozone for dental use is generated chairside from pure medical oxygen using calibrated ozone generators at concentrations of 1–80 ppm (parts per million), depending on the clinical application. It is delivered as ozone gas, ozonated water (water continuously bubbled with ozone), or ozonated oil (ozone dissolved into olive or sunflower oil for sustained-release application to soft tissues).

$30 – $150

Per application, fee-for-service cash pay, per Real Dental Costs' analysis of practice fee data (reviewed May 2026), which puts periodontal pocket treatment at $100–$300 per visit and notes that ozone is almost always paid out of pocket because insurers do not assign it a billable code. Ozone is typically used as an adjunct to other procedures rather than a standalone treatment; many biological dentists incorporate ozone into restorative, endodontic, and periodontal appointments without itemizing it separately.

Clinical Applications in Biological Dentistry

Caries: Pre-Restorative Disinfection

Applied to a carious lesion before restoration, ozone gas or ozonated water reduces counts of cariogenic bacteria such as Streptococcus mutans in laboratory and short-term clinical studies. That has not been shown to improve the restoration: a 2020 systematic review and meta-analysis (Santos et al., Journal of Evidence-Based Dental Practice) rated the evidence very low certainty and found not enough support from randomized trials to recommend ozone for treating caries, and a 2025 systematic review (Rezaeianjam et al., BMC Oral Health) advised against ozone in restorative dentistry because of possible adverse effects on dentin bond strength — the property adhesive restoration placement depends on.

For early lesions that do not yet need a filling, the American Dental Association's 2018 clinical practice guideline on nonrestorative caries treatment recommends agents such as 38% silver diamine fluoride, sealants and 5% sodium fluoride varnish. Ozone is not among its recommended agents, and the guideline recommends against 10% casein phosphopeptide–amorphous calcium phosphate. Arresting a lesion without drilling is the minimally invasive approach most aligned with the biomimetic philosophy; the evidence decides which agent does it.

Endodontic Disinfection

Root canal systems are three-dimensional anatomical networks — lateral canals, accessory canals, isthmi, and apical deltas — that conventional endodontic instruments and sodium hypochlorite irrigation cannot fully penetrate or sterilize. Residual bacteria in these inaccessible zones are a primary cause of endodontic treatment failure and periapical re-infection.

Ozonated water has been tested as a root canal irrigant after mechanical instrumentation. It is not a proven substitute for sodium hypochlorite: in an in vitro study in the International Endodontic Journal (Hems et al., 2005), ozone had little effect on Enterococcus faecalis embedded in biofilm, and its antibacterial efficacy was not comparable with sodium hypochlorite. Where it is used, it is an adjunct to standard irrigation, not a replacement.

Periodontal Pocket Decontamination

Periodontal pockets infected with gram-negative anaerobic bacteria (Porphyromonas gingivalis, Treponema denticola, Tannerella forsythia — the "red complex" pathogens) respond to ozonated water irrigation or ozone gas application through a periodontal endoscope. A 2025 systematic review and meta-analysis (Liu et al., BMC Oral Health) found that ozone added to scaling and root planing improved probing depth and gingival index compared with scaling and root planing alone, without more adverse reactions. Whether ozone reduces the need for antibiotics has not been shown.

Implant Surface Decontamination (Peri-Implantitis)

Peri-implantitis — the inflammatory disease of tissue around dental implants, often leading to bone loss and implant failure — is notoriously difficult to treat because bacterial biofilm on the implant surface is protected within the rough titanium surface topography. Ozone gas or ozonated water is one of several decontamination adjuncts used alongside laser treatment and air-abrasion in peri-implantitis management. The evidence is thin: a 2023 systematic review of ozone in implant dentistry (Randi et al.) found five eligible studies, only one at low risk of bias, and found that a definitive conclusion cannot be drawn.

Mechanism Is Not Outcome

The antimicrobial mechanism of ozone is well-characterized chemistry — oxidative disruption of microbial cell-wall lipids and protein sulfhydryl groups. A kill mechanism in the laboratory is not a demonstrated clinical benefit. A 2020 systematic review of ozone for caries (Santos et al.) rated the evidence very low certainty, and a 2023 review of implant uses (Randi et al.) found most studies at high risk of bias; a 2025 meta-analysis (Liu et al.) found a benefit as an adjunct to scaling and root planing. The FDA's ozone regulation, 21 CFR 801.415, states that ozone has no known useful medical application in specific, adjunctive or preventive therapy.

Safety Considerations

Ozone is a toxic gas. The FDA's regulation, 21 CFR 801.415, records that inhaled ozone irritates the mucous membranes and can cause pulmonary edema, with onset delayed for hours, and that its odor is not a reliable warning of concentration. It limits ozone accumulating in rooms people occupy to 0.05 ppm; the occupational limit for workers is 0.1 ppm averaged over an 8-hour day (OSHA, 29 CFR 1910.1000 Table Z-1). Dental ozone systems rely on sealed delivery and high-volume evacuation to keep the gas out of the airway — ask the clinic which device it uses and how it is scavenged.

Patients with severe asthma, hyperthyroidism, or active bleeding disorders should discuss ozone therapy with their dentist and physician before treatment. Ozone oil application to open wounds requires caution in immunocompromised patients.

Credentials to Verify

  • IAOMT
    International Academy of Oral Medicine and Toxicology — the body behind the SMART amalgam-removal accreditation. An IAOMT listing does not certify ozone use; ask the clinic which device and protocol it uses.
  • IABDM
    International Academy of Biological Dentistry and Medicine — ozone therapy is a core clinical modality within the IABDM curriculum.

Frequently Asked Questions

Does ozone therapy replace drilling?

No. Ozone cannot restore lost tooth structure, and its effect on decay is not established: a 2020 systematic review and meta-analysis (Santos et al., Journal of Evidence-Based Dental Practice) found not enough support from randomized trials to recommend ozone for treating caries, and a 2025 systematic review (Rezaeianjam et al., BMC Oral Health) advised against ozone in restorative dentistry because it may weaken dentin bonding. For early lesions, the American Dental Association's 2018 guideline recommends nonrestorative agents such as silver diamine fluoride, sealants and fluoride varnish.

Is ozone therapy covered by insurance?

No — ozone therapy is not covered by dental insurance plans in the United States. It is an out-of-pocket biological dentistry adjunct. Costs are typically incorporated into the appointment fee when used as an adjunct to other procedures.

How many ozone sessions do I need?

There is no evidence-based standard. Protocols vary by clinic and device, and the systematic reviews cited on this page do not establish a number of sessions that improves outcomes. Ask the clinic what protocol it proposes, why, and how the ozone is evacuated during treatment.