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Objective: Investigating the usability of the Dutch version of the Oral Health Assessment Tool (OHAT‐NL) with informal caregivers of community‐dwelling older people with suspected dementia, without specific training. Materials and methods: In accordance with guidelines for establishing the cultural equivalency of instruments, the OHAT was translated into Dutch. Fifteen informal caregivers of community‐dwelling older people with suspected dementia and, as a reference standard, a dentist assessed the oral health of the older people using the OHAT‐NL. The caregivers' scores were compared with the dentist's scores. The usability of the OHAT‐NL was rated on a 10‐point scale (0 = incomprehensible, and 10 = very user friendly) and investigated further through short structured interviews. Results: There were differences between the dentist's and caregivers' assessments of the individual categories of the OHAT‐NL. The specificity of the need to visit an oral health care professional was 100.0%, while the sensitivity was 78.6%. The informal caregivers concluded that the tool made them more aware of different aspects of oral health. The tool was rated with a mean score of 7.7 (SD 1.7). Conclusion: The OHAT‐NL could be a useful tool for informal caregivers without specific training to indicate whether the person they care for should visit an oral health care professional. [ABSTRACT FROM AUTHOR]