Many health professions have identified characteristics of an effective clinical instructor and used this information to create tools to measure clinical teaching effectiveness (CTE) in their disciplines. However, minimal research has been conducted to explore the attributes of an effective clinical instructor in dental hygiene education. The aim of this study was to identify the attributes of dental hygiene clinical instructors associated with effective teaching. This study used a Delphi research design to iteratively survey an expert panel of 14 dental hygiene instructors in dental hygiene programs from 13 U.S. states in 2019. A cumulative overall response rate of 89.3% was achieved after conducting three survey rounds. The results showed statistically significant consensus on 91 CTE characteristics. Participants agreed that effective clinical instructors should possess the ability to clearly communicate, foster interpersonal relationships, encourage a climate of mutual respect, and act as good role models who are emotionally intelligent, caring, trustworthy, fair, honest, and supportive. There was also agreement that effective clinical instructors were those who created a safe learning environment centered on collaboration, motivation, guidance, and positive corrective feedback. These results were similar to those identified in other health professions. However, there is a need for dental hygiene education to develop its own CTE assessment tool for use in professional development.