Background Dental phobia is part of the Blood‐Injection‐Injury (B‐I‐I) phobia subtype of specific phobia within DSM‐IV‐TR. To investigate the conceptual validity of this classification, the purpose of the present study was to determine the co‐occurrence of dental phobia, typical dental (and B‐I‐I related) fears, vasovagal fainting, and avoidance of dental care. Method Data were collected by an online survey in Dutch twin families (n = 11,213). Results Individuals with a positive screen of dental phobia (0.4% of the sample) rated typical B‐I‐I‐related stimuli as relatively little anxiety provoking (e.g. of all 28 fears the stimulus “the sight of blood” was ranked lowest). Presence of dental phobia was significantly associated with a history of dizziness or fainting during dental treatment (OR = 3.4; 95% CI: 1.5–8.1), but of the dental phobic individuals only 13.0% reported a history of dizziness or fainting during dental treatment. Presence of dental phobia (OR = 5.0; 95% CI: 2.8–8.8) was found to be associated with avoidance of dental care, but a history of dizziness or fainting during dental treatment was not (OR = 1.0; 95% CI: 0.8–1.2). Conclusions The present findings converge to the conclusion that dental phobia should be considered a specific phobia subtype independent of the B‐I‐I cluster within the DSM classification system.