Introduction: Obstructive Sleep Apnea (OSA) is a sleep-related breathing disorder, in which there are cessations of breathing lasting for at least 10 seconds. OSA affects 3-10% of the population, and 70% of the patients are over 65 years of age. It is more common in men and subjects with a higher body mass index. OSA appliances are also becoming more widely known in Slovenian dentistry. Their purpose is to make it easier for the patient to breathe without interruptions in sleep. There are two main types of OSA oral appliances; one that keeps a mandible in a protruded position, and the other that pulls a tongue forward. Objectives: The main objective was to perform an overview of OSA oral appliances in the English-speaking market, to describe, compare, and present the advantages and limitations for each of them. An additional objective was a detailed presentation of the laboratory phases of the manufactured Silensor oral appliance (Erkodent, Germany) and Liberty Bielle oral appliance (RMO, France). Both appliances are made of vacuum-formed foil. The Silensor appliance has plastic connectors, while the Liberty Bielle oral appliance has cold polymerizing acrylate and metal connectors. We compared them from the manufacturing point of view, as well as the costs and time required to complete the appliance. Methods: We used English in Slovenian scientific literature related to OSA. We used Google search engines, PubMed, Google Scholar, and OVID Medline databases to search the literature. We searched according to the keywords related to OSA and then produced two oral appliances in the dental laboratory. We made the time and cost calculations for processing these two appliances. Results: We found 25 different structural variations of OSA oral appliances in the literature and electronic databases. The time required to manufacture the appliance with plastic connectors was 330 min, and for the one with metal connectors, it was 465 min. The laboratory cost estimate was €83.44 for the first appliance and €147.28 for the second appliance. Discussion in conclusions: In general, there are at least 25 different structural variations of OSA oral appliances worldwide. The oral appliance with metal connectors enables the better movement of the lower jaw but is almost twice as expensive and more difficult to manufacture in comparison to the one with plastic connectors.