Introduction Head and neck cancer (HANC) significantly impacts the oral cavity and dental health issues may complicate cancer treatment and post-treatment quality of life. Pre-treatment dental evaluation is critical for identifying and managing existing oral health problems. However, limited literature exists on the dental health status of patients at the time of HANC diagnosis. This study aims to address this gap and emphasise the importance of dental care in the management of HANC.Methods A retrospective analysis of medical records was conducted on patients scheduled for radiotherapy for HANC. Data on demographic characteristics, tumour characteristics and dental exam findings were extracted from the patient record.Results Of the 191 included patients, the average age was 62.9 years (SD: 10.09), with 80% being men. The prevalence of dental disease revealed 59% of cases presenting with unstable periodontal disease and an average decayed, missing, and filled teeth score of 19.9. Two-thirds of patients exhibited one or more carious lesions.Conclusion This retrospective study sheds light on the dental health status of patients with HANC at their pre-treatment evaluation. The high prevalence rates of dental caries and unstable periodontal disease highlight the importance of dental evaluation and intervention as part of the overall management of HANC patients.