Biological width refers to the combined apico-coronal dimension of the junctional epithelium and the supracrestal connective tissue attachment. It represents the vertical dimension of soft tissues adhering to the surface of a tooth or implant, forming a physiological protective barrier against the oral environment. The preservation of this structure plays a crucial role in the long-term stability of peri-implant tissues and the success of implant-supported prosthetic treatment. The aim of this article is to discuss the structure and function of biological width around dental implants, highlighting its role in protecting the crestal bone, maintaining soft tissue integrity, and presenting the factors that influence its formation and preservation, such as implant placement depth, prosthetic design, and soft tissue morphology. This review is based on an analysis of articles retrieved from major biomedical databases (PubMed, Scopus, Medline, and Web of Science). A total of 76 publications were identified using keywords such as biological width, dental implants, peri-implant soft tissues, healing abutments, submucosal components, abutment polishing, peri-implantitis, and abutment design. Of these, 40 articles were selected for in-depth qualitative evaluation.