This thesis was held in the city of Trujillo, Province of Trujillo, La Libertad Region, with the Denti Laser Dentistry Center as the object of study. Its general objective was to establish the relationship that exists between relational marketing and customer loyalty in the company under study; In this regard, the problem was: What is the relationship between Relationship Marketing and Customer Loyalty at Denti Laser Dentistry Center, Trujillo, year 2018? The study population was represented by 310 active clients, with the respective sample being 111 clients to whom the survey technique was applied, whose instrument was the questionnaire; the research design used was non-experimental, descriptive type transectional or cross-correlational. After the respective analysis of the results has confirmed the hypothesis that establishes that there is a positive relationship between relational mar...