The purpose of this study was two-folded. Firstly, it investigated the changes in preservice teachers’ professional identity after a four-week block practicum; Secondly, it examined the role of mentor teachers in creating changes in their professional identity. The author concludes that mentoring relationships played a significant role in shaping preservice teachers’ teacher identity. The detailed feedback mentor teachers provided and their positive interactions, helped preservice teachers build higher levels of confidence, and demonstrate a deeper understanding of their role as a teacher.