A Dutch-language version of the Oral Health Impact Profile, a questionnaire by means of which the impact of oral health on the quality of life of patients can be determined, was developed and subsequently psychometrically tested among a group of patients with complaints concerning missing dentition or their dentures. In addition, a shortened version of this so-called OHIP-NL49, the OHIP-NL14, was psychometrically tested among a group of patients with temporomandibular disorders. The psychometrical characteristics of both the OHIP-NL49 and the OHIP-NL14 were very good: both the reliability and the validity were high. The conclusion was, that the OHIP-NL49 and the OHIP-NL14 are well suited for determining the impact of oral health on the quality of life.