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Background Halitosis represents a common dental condition, although sufferers are often not conscious of it. The aim of this study was to examine behavior in a sample of Italian subjects with reference to self-reported halitosis and emotional state, and specifically the presence of dental anxiety. Methods The study was performed on Italian subjects (N = 1052; range 15-65 years). A self-report questionnaire was used to detect self-reported halitosis and other variables possibly linked to it (sociodemographic data, medical and dental history, oral hygiene, and others), and a dental anxiety scale (DAS) divided into two subscales that explore a patient's dental anxiety and dental anxiety concerning dentist-patient relations. Associations between self-reported halitosis and the abovementioned variables were examined using multiple logistic regression analysis. Correlations between the two groups, with self-perceived halitosis and without, were also investigated with dental anxiety and with the importance attributed to one's own mouth and that of others. Results The rate of self-reported halitosis was 19.39%. The factors linked with halitosis were: anxiety regarding dentist patient relations (relational dental anxiety) (OR = 1.04, CI = 1.01-1.07), alcohol consumption (OR = 0.47, CI = 0.34-0.66), gum diseases (OR = 0.39, CI = 0.27-0.55), age > 30 years (OR = 1.01, CI = 1.00-1.02), female gender (OR = 0.71, CI = 0.51-0.98), poor oral hygiene (OR = 0.65, CI = 0.43-0.98), general anxiety (OR = 0.66, CI = 0.49-0.90), and urinary system pathologies (OR = 0.46, CI = 0.30-0.70). Other findings emerged concerning average differences between subjects with or without self-perceived halitosis, dental anxiety and the importance attributed to one's own mouth and that of others. Conclusions Halitosis requires professional care not only by dentists, but also psychological support as it is a problem that leads to avoidance behaviors and thereby limits relationships. It is also linked to poor self care. In the study population, poor oral health related to self-reported halitosis was associated with dental anxiety factors.