Ozone (triatomic oxygen or trioxygen) is the combination of three naturally occurring oxygen atoms. Ozone therapy is an alternative to traditional approaches in dentistry. The main feature suggests that ozone can be used in dentistry as a strong antimicrobial agent. In addition, ozone has antimicrobial, immune system regulatory, metabolic rate, and biosynthesis-enhancing effects. Ozone affects cellular and humoral immunity. It has positive effects on oxygen transport in the body; production of adenosine triphosphate (ATP); and production of enzymes such as glutathione peroxidase, catalase, and superoxide dismutase. Ozone use in dentistry can be made possible via ozone gas, ozonated water, ozonized olive, or sunflower oil. Ozone is used in periodontology (gingivitis, periodontitis, periimplantitis, surgical injuries, prophylaxis), oral pathologies (stomatitis, aphthous ulceration, candidiasis, herpes infections), endodontics (root canal treatment, the fistula, abscesses), oral surgery (hemostasis, wound healing, implantation, reimplantation, tooth extraction), prosthodontics (disinfection of crowns, disinfection of the alloy part of partial dentures), orthodontics (TME function disorders, trismus, myoarthropathies), and restorative dentistry (caries, dentine hypersensitivity, cracked tooth syndrome, bleaching, disinfection of cavity). As a result of the studies performed, ozone therapy in dentistry should be considered as an aid to conventional treatments.