Purpose: To compare self‐reported (SR) and interviewer‐rated (IR) oral health between schizophrenia (SZ), bipolar disorder (BP), and major depressive disorder (MDD) patients. Design and Methods: 356 patients with SZ, BP, or MDD underwent assessments of psychopathology, side effects, SR, and IR oral health status. Findings: 118 patients (33.1%) reported poor oral health; the corresponding proportion was 36.4% in BP, 34.8% in SZ, and 25.5% in MD (p =.21). SR and IR oral health correlated only modestly (r = 0.17–0.36) in each group. Practice Implications: Psychiatric patients need to be assessed for both SR and IR oral health.