The notion and practice of critical thinking (CT) has moved from its speculative formation by John Dewey to a standard element in teacher education curricula and standards. In the process, CT has narrowed its focus to the analysis and articulation of logical thought, and lost transformative value. In this paper, we examine the conception and implementation of CT in three teacher education domains primarily in the United States--music, media and information literacy, and social studies--asking how CT has deformed education in those domains, and how domain-specific approaches could reinvigorate CT. We further suggest refocusing the purpose of CT in teacher education on accomplishing transformative education for equity in school and society, by implementing a critically reflective, transformative praxis based on the insights of domain-specific approaches to CT.