[The oral mucosa and delayed hypersensitivity].

Buccal mucosal allergies are rare because the conditions for sensitization are less favourable in the buccal environment. Clinical presentation is dominated by subjective manifestations (hardening, hypersialorrhea, "burning mouth" syndrome). Extradental etiologies are linked with cosmetic and medicinal topics, as well as dental etiologies caused by metals, alloys of mercury and resins.