Ozone therapy in dentistry is an interesting idea, but current research does not show that it reliably stops or reverses tooth decay. A Cochrane review concluded there is no reliable evidence that applying ozone gas to decayed teeth halts or reverses decay, largely because the available studies carried a high risk of bias. If you have been offered ozone treatment for cavities, or you have read about it online, this guide explains what ozone therapy is, what the evidence says, and which options for early decay have stronger support. If you are worried about a soft spot or a white mark on a tooth, our guide to whether you can reverse a cavity is a good companion read.
Key Takeaways
- Ozone is used by some practitioners as a gas, as ozonated water or in ozonated oils, mainly for decay, root canal disinfection, gum disease and mouth ulcers.
- A Cochrane review found no reliable evidence that ozone gas stops or reverses decay, and a later systematic review rated the evidence as very low certainty.
- Individual studies report ozone is generally well tolerated, but ozone is a lung irritant, so any system used in the mouth must be sealed.
- Early decay often responds to well-studied options such as fluoride varnish, high-fluoride toothpaste, fissure sealants and silver diamine fluoride.
- The simple rule: choose the option with the strongest evidence for your situation, and ask your dentist what the research shows before agreeing to any newer treatment.
What Is Ozone Therapy in Dentistry?
Ozone (O3) is a form of oxygen made of three oxygen atoms instead of two. It is unstable and breaks down quickly, and in the process it reacts strongly with bacteria, viruses and fungi. That antimicrobial effect is why some dental practitioners became interested in it as a way to disinfect teeth and gums without drilling or antibiotics.
In dental settings, ozone is typically used in three forms:
- Ozone gas: delivered through a small cup or hand piece sealed over a tooth, usually for a short period, aiming to kill the bacteria in an early cavity.
- Ozonated water: used as a rinse or irrigant, for example during root canal treatment or around the gums.
- Ozonated oils: applied to mouth ulcers, sore spots or gum tissue.
The theory is reasonable: decay is driven by acid-producing bacteria, so reducing them inside a lesion might let the tooth remineralise. The question is whether this happens reliably in real mouths.
Does Ozone Dental Therapy Work for Cavities?
For tooth decay, the best summaries of the research do not support ozone as a reliable treatment. A Cochrane review, which pools and grades the available clinical trials, concluded there is no reliable evidence that applying ozone gas to the surface of decayed teeth stops or reverses the decay process. The reviewers noted that many trials had a high risk of bias, used inconsistent outcome measures, or were too small to draw firm conclusions.
A later systematic review and meta-analysis published in the Journal of Evidence-Based Dental Practice reached a similar conclusion. It rated the certainty of evidence as very low and found it was not enough to recommend ozone for managing caries.
That does not mean ozone is harmful when used properly, or that the clinicians who use it are acting in bad faith. Research in dentistry moves slowly, and a lack of strong evidence is different from proof that something does not work. It does mean that, for now, ozone is best viewed as an unproven option rather than a substitute for treatments with a longer track record.
Other uses: root canals, gums and ulcers
Ozonated water and gas have also been studied for root canal disinfection and gum treatment, and ozonated oils for mouth ulcers. Results are mixed and most studies are small. Established root canal disinfectants and professional gum cleaning have a much larger body of research behind them.
Is Ozone Safe in the Mouth?
Individual clinical studies generally report that ozone treatment is well tolerated by patients, with few reported side effects. It does not involve drilling or local anaesthetic, which is part of its appeal, particularly for anxious patients and children.
The main safety consideration is that ozone is a lung irritant. Breathing it in can irritate the airways, so dental ozone systems are designed to be sealed over the tooth and to draw the gas back out before the cup is removed. If you are considering ozone treatment, it is reasonable to ask how the device prevents ozone from being inhaled, particularly if you have asthma or another lung condition.
A second consideration is indirect. If ozone is used in place of a proven treatment and the decay continues to progress quietly, the tooth may end up needing a larger filling later. Regular monitoring with examinations and X-rays matters whichever approach you choose.
Ozone vs Evidence-Based Options for Early Decay
Early decay (often seen as a chalky white spot or a shallow brown area that has not yet formed a hole) can often be managed without a drill. The options below are those I discuss most often with patients, alongside ozone for comparison.
| Option | How it works | Strength of evidence | Typical use |
|---|---|---|---|
| Ozone gas | Antimicrobial gas applied in a sealed cup over the tooth | Very low certainty; Cochrane found no reliable evidence for decay | Offered by some practitioners for early lesions |
| Fluoride varnish | Concentrated fluoride painted on to strengthen enamel and support remineralisation | Strong; widely recommended for children and higher-risk adults | Early lesions, sensitive roots, high decay risk |
| High-fluoride toothpaste | Prescription-strength fluoride used at home each day | Strong, particularly for root surfaces | Adults with high decay risk or dry mouth |
| Fissure sealants | Thin protective coating over the grooves of back teeth | Strong for preventing decay in pits and fissures | Children's molars, some adult teeth |
| Silver diamine fluoride | Liquid that arrests active decay; stains the decayed area dark | Good for arresting decay, especially in children and older adults | When drilling is difficult or not preferred |
| Resin infiltration | Low-viscosity resin seeps into early enamel lesions and seals them | Moderate and growing | White spots on smooth surfaces and between teeth |
| Minimally invasive filling | Removes only decayed tissue and restores with tooth-coloured material | Long-established | Lesions that have formed a cavity |
Silver diamine fluoride deserves a special mention because it is one of the few treatments that can arrest active decay without drilling. The trade-off is a dark stain on the decayed area. You can read more in our article on silver diamine fluoride (SDF). Related approaches such as the silver modified atraumatic restorative technique combine SDF with a simple filling material.
Other Drill-Free and Low-Drill Options
Patients who ask about ozone are often looking for a gentler experience, and that is a fair goal. Several other approaches aim to keep treatment as conservative as possible. Air abrasion uses a fine stream of particles to remove small areas of decay, and is covered in our guide to minimally invasive dentistry and air abrasion. Dental lasers are used by some clinics for certain soft and hard tissue procedures, explained in our article on laser dentistry uses and benefits.
In my experience, the biggest difference for early decay often comes from the basics: brushing twice a day with fluoride toothpaste, cleaning between the teeth, reducing how often you have sugary snacks and drinks, and attending regular check-ups so small changes are caught early. These steps cost little and have strong evidence behind them.
Questions to Ask Before Choosing Ozone Treatment
If a practitioner offers you ozone treatment, it is perfectly reasonable to ask questions so you can make an informed decision:
- What does the research show for my specific problem, and how strong is that evidence?
- What are the alternatives, and how do their results compare?
- How will we monitor the tooth to confirm the decay has stopped?
- How is the ozone contained so I do not breathe it in?
- What will it cost, and is it claimable on my health fund extras?
A good clinician will welcome these questions. Lumi Dental does not offer ozone therapy, but a dentist can assess early decay, explain the evidence-based options and refer elsewhere where appropriate if you would like to explore a different approach.
Frequently Asked Questions
Can ozone therapy reverse a cavity?
There is currently no reliable evidence that ozone reverses a cavity. A Cochrane review and a later meta-analysis both found the evidence too weak to recommend ozone for decay. Very early lesions can sometimes remineralise with fluoride and diet changes, which have stronger support.
Is ozone dental treatment painful?
Most patients find ozone treatment comfortable, and it does not usually require drilling or anaesthetic. Studies generally report it is well tolerated. Comfort alone, however, does not tell you whether the treatment is effective.
Is ozone therapy approved in Australia?
Some practitioners in Australia use ozone devices, but availability is limited and practice varies. If you are considering it, ask about the specific device, the evidence for your condition and how the gas is contained.
What is the best treatment for early tooth decay?
The best treatment depends on where the decay is and how far it has progressed, but fluoride varnish, high-fluoride toothpaste, sealants and silver diamine fluoride all have good evidence for early lesions. A dentist can examine the tooth, take X-rays if needed and recommend the most conservative option that suits you.
Book a Check-Up
If you have noticed a white spot, sensitivity or a change in a tooth, the most useful first step is an examination. The team at Lumi Dental in Melrose Park can check for early decay, talk through the evidence-based options and help you keep as much natural tooth as possible. Learn more about general dentistry at Lumi Dental, or see current deals for check-up pricing. A written quote can be provided after your examination if treatment is needed.
This article is general information only and is not a substitute for personalised advice from a registered dental practitioner.
