SalivaMouth MucosaMouth DiseasesIntestinal MucosaMouth NeoplasmsGastric MucosaLeukoplakia, OralLichen Planus, OralTongue DiseasesSaliva, ArtificialOral UlcerCheekLip DiseasesOral Submucous FibrosisTongueBurning Mouth SyndromeMouthNasal MucosaStomatitisSalivary Proteins and PeptidesGingivaStomatitis, AphthousMucous MembraneDenturesJaw, EdentulousLeukoplakiaCandidiasis, OralGingival DiseasesTongue, FissuredHyperpigmentationMouthwashesCarcinoma, Squamous CellEosinophilic GranulomaPrecancerous ConditionsUrethral StrictureUrologic Surgical Procedures, MaleLichen PlanusKeratinocytesStomatitis, DentureSalivationAdministration, BuccalHerpanginaEpitheliumPalateParotid GlandXerostomiaSkin Diseases, GeneticPalatal NeoplasmsLichenoid EruptionsPalate, HardKeratinsTobacco, SmokelessCheilitisGlossitisImmunohistochemistryLipTongue NeoplasmsEpithelial CellsGranuloma, PyogenicTolonium ChlorideReticulinBiopsyLasers, GasMouth FloorLip NeoplasmsCandida albicansSalivary GlandsPrilocaineGingival NeoplasmsOlfactory MucosaPemphigusColonSkinCarcinoma, VerrucousLaryngeal Mucosa4-Nitroquinoline-1-oxideNail DiseasesSubmandibular GlandArecaWharton JellySkin Diseases, VesiculobullousGingivitisGlossitis, Benign MigratoryPemphigoid, Benign Mucous MembraneMesocricetusImmunoglobulin A, SecretoryMasticationPapillomaUrethral DiseasesGanodermaImmunity, MucosalPalate, SoftUrethraKeratosisSublingual GlandPolymerase Chain ReactionHead and Neck NeoplasmsOropharynxMicronucleus TestsCase-Control Studies