What a gas can (and can't) do for a cavity

Ozone is a treatment some dentists use on early cavities. The name sounds high-tech, but the idea is simple.

What ozone is

Ozone is a form of oxygen. The oxygen we breathe travels in pairs of two atoms (O₂). Ozone is three atoms (O₃), and that third atom makes it highly reactive: it breaks apart the cell walls of the bacteria, viruses, and fungi it touches. In the dental chair we deliver it as a gas, a water rinse, or an oil, applied right to a tooth or along the gumline.

That reactivity is what lets ozone disinfect. It kills the bacteria that drive decay and gum inflammation, and it does so without a drill, without a needle, and without harsh chemicals.

What it's good at

The strongest case for ozone is early decay: a soft spot that hasn't yet collapsed into a full cavity. Clearing the bacteria out of that spot, and giving the tooth's own minerals a chance to re-harden it — a natural process called remineralization, sometimes with help from a remineralizing agent — can stop the problem before it ever needs a filling.

Careful reviews of the research report no adverse events from dental ozone, which means it is well tolerated.¹ That safety, plus no drill and no needle, is why we reach for it so often with anxious and needle-averse patients.

What it can't do

Ozone does not cure a cavity. Once decay has broken through the enamel and formed an actual hole, no amount of disinfecting rebuilds the lost structure. A tooth that far gone still needs a filling.

The evidence that ozone cures decay is also thin. The most careful review to date found "very low certainty of evidence" and "not enough support from published RCTs to recommend the use of ozone for the treatment of dental caries."¹ RCTs — randomized controlled trials — are studies that test a treatment against a placebo or another option. In plain terms: ozone is safe, and it disinfects well, but the proof that it reverses cavities on its own is not there yet.

Where it fits

We use ozone for what it does well: disinfecting early spots gently, supporting a tooth's own repair, calming inflamed gums, and easing sensitive roots. It also gives a low-stress option to people who want to avoid the drill. When a tooth needs a filling, we say so plainly, and ozone often still helps by cleaning the area first.

This follows the same approach we take throughout: treat a problem the smallest way that works, and be clear about where the small way runs out.

If you have an early spot or sensitive gums and want to know what ozone can do for it, we can look at the tooth together and talk through your options at your next visit.