Background: Cystic Fibrosis is the most common autosomal recessive genetic condition in the Caucasian population. Oral health in adults with Cystic Fibrosis is an area lacking in research, due to their historic low life expectancy. The age profile of people with Cystic Fibrosis (CF) is increasing, due in part to improved therapies. Further study is needed in order to ascertain their dental needs and improve provision of care to these medically vulnerable individuals.Methods: A cross sectional survey was carried out. A structured, anonymous online questionnaire, with both quantitative and qualitative aspects, was used to obtain information regarding their feelings towards dentists and dental appointments. The final version of the questionnaire was based on a collaborative effort between researchers at Cork University Dental School and Hospital and Cystic Fibrosis patient advocates from Cystic Fibrosis Ireland. The inclusion criteria were people over the age of 18 years with a diagnosis of CF. Participants were recruited via CF Ireland’s mailing list and social media channels. The quantitative portion of the questionnaire underwent statistical analysis using IBM SPSS. The qualitative portion underwent inductive thematic analysis.Results: A total of 71 adults with CF responded to the survey. 54.9% of respondents were unhappy with their teeth. 63.4% felt that CF had an impact on oral health. 33.8% were anxious about attending their dentist. 54.9% felt that dentists should be part of the multidisciplinary team. Respondents believed that CF has impacted on their oral health due to the medications and dietary requirements involved, as well as tiredness and other side effects of CF. Some reasons for being anxious about attending the dentist involve cross infection concerns, issues with the dentist, with tolerating treatment, and with the teeth themselves. They wanted dentists to be aware of the practicalities of dental treatment for people with CF, especially their discomfort with lying back. They also want the dentist to be aware of the impact that their medication, treatment and diet has on their oral health.Conclusions: Over a third of PWCF reported anxiety about attending the dentist. Reasons for this included fear, embarrassment, cross infection concerns and problems with treatment, especially being in the supine position. PWCF want dentists to be aware of the impact that CF can have upon dental treatment and oral health care.