Objectives: This study aims to investigate the impact of clinical dental hygienists on customer orientation and prepare basic data for the rational and efficient human resource management of dental hygienists. Methods: A self-reported questionnaire was completed by 220 dental hygienists from July 7 to August 8, 2019. Data were analyzed using the IBM SPSS Statistics 22.0 program with a significance level of 0.05. Results: The customer orientation of clinical dental hygienists was 4.09, internal marketing was 3.10, organizational citizenship behavior was 3.97, and self-efficacy was 3.91. The variables that most influenced their turnover intention were those related to organizational citizenship behavior. These factors showed a 28.8% variance among dental hygienists. Conclusions: This study recommends the development and application of a program that enhances dental hygienists’ customer orientation, recognizes them as internal clients, and improves dental productivity.