Patients with complete dentures will often present to a clinician complaining that their dentures are loose. A careful history, clinical examination and denture examination is needed so that the cause of their loose dentures can be determined. Only once a suitable diagnosis has been reached can an appropriate treatment plan be developed. This paper aims to guide readers through this history and examination process to help them formulate a suitable diagnosis before embarking on any potential treatment options. CPD/Clinical Relevance: The paper provides a guide as to how to assess an edentulous patient presenting with loose complete dentures.