Tehran University of Medical Sciences Journal of Sleep Sciences 2476-2938 8 3-4 2026 07 26 90 99 Maryam Jahangiri Department of Prosthodontics, School of Dentistry, Shahed University of Medical Sciences, Tehran, Iran Sayed Shojaedin Shayegh Department of Prosthodontics, School of Dentistry, Shahed University of Medical Sciences, Tehran, Iran 2024 08 03 2025 12 18 Background and Objective: Obstructive sleep apnea (OSA) and snoring are common conditions that adversely affect sleep quality. Snoring has several etiologies; however, difficulty in airflow through the upper airways is considered a principal mechanism. If snoring persists despite addressing the underlying causes, appliances can help reduce snoring. A variety of appliances with different mechanisms have been proposed. This review aimed to classify appliances, their mechanisms of action, and methods of fabrication. Materials and Methods: This systematic review was conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. A literature search was performed in PubMed, Scopus, and Google Scholar for studies published between 1995 and 2024 using the following keywords: mandibular advance-ment devices, obstructive sleep apnea, snoring, continuous positive airway pressure, and dentistry. Results: Of the 200 initially identified articles, 25 relevant abstracts were selected for full-text review, and 13 studies were ultimately included in the review. This study investigated the fabrication methods and characteristics of snoring appliances. Based on the reviewed literature, appliances used for snoring and OSA management were categorized into five groups: custom-made mandibular advancement splints (MASs), prefabricated mandibular advancement devices (MADs), modified complete dentures, bite-raising appliances (BRAs), and tongue-retaining devices (TRDs). Conclusion: A wide variety of appliances have been proposed for snoring. MASs are the most frequently reported appliances, followed by TRDs. Current evidence suggests that these appliances are primarily effective in mild and mod-erate cases. https://jss.tums.ac.ir/index.php/jss/article/view/296