Pain ThresholdToothacheAnalgesicsPainPain PerceptionPain MeasurementAnalgesics, OpioidSensory ThresholdsMouthwashesOral HealthTranscutaneous Electric Nerve StimulationPain ManagementAnalgesics, Non-NarcoticStomatitisDental Health SurveysAnalgesiaHyperalgesiaPain, PostoperativeMouth DiseasesMouth MucosaChronic PainSalicylatesThermosensingNociceptorsPain, ReferredEar, ExternalDental CariesMorphineDental Pulp TestHot TemperatureFacial PainFibromyalgiaLow Back PainAcupuncture AnalgesiaPressurePhysical StimulationAcupuncture PointsNeuralgiaNeck PainNociceptive PainPain, IntractableBack PainWristSensationHypesthesiaMyofascial Pain SyndromesDouble-Blind MethodAbdominal PainAcetaminophenAnesthetics, LocalElectroacupunctureDifferential ThresholdAcute PainElectric Stimulation TherapyTramadolAcupuncture TherapyHyperesthesiaPelvic PainLidocaineAuditory Thresholdbeta-EndorphinAnti-Inflammatory Agents, Non-SteroidalInjections, SpinalElectric StimulationDrug ToleranceSomatosensory DisordersTime FactorsAnalysis of VarianceCold TemperatureIrritable Bowel SyndromeNaloxoneMigraine DisordersSkin TemperatureRadial NerveTemporomandibular Joint Dysfunction SyndromeCross-Over StudiesChronic DiseaseVibrationWhiplash InjuriesPhenacetinRats, Sprague-DawleySpinal CordDose-Response Relationship, DrugShoulder PainPreanesthetic MedicationEndorphinsEdemaMusculoskeletal PainEvoked Potentials, SomatosensoryBehavior, AnimalSkin Physiological PhenomenaTouchPeriaqueductal GrayDextropropoxyphenePerceptionTreatment OutcomeNAV1.7 Voltage-Gated Sodium ChannelCodeineSkinFentanyl