Different Perspectives of Anatomical Variations in Dentistry: Anatomical Variations from the Point of View of Oral and Maxillofacial Surgeons -- Anatomical Variations from the Point of View of the Periodontist -- Anatomical Variations from the Point of View of the Endodontist. Mandible: Anatomy and Variations of the Pterygomandibular Space -- Anatomy and Variations of the Retromolar Fossa -- Anatomy and Variations of the Mental Foramen -- Variant Anatomy of the Mandibular Torus. Maxillary Sinus: Anatomy and Variations of the Floor of the Maxillary Sinus -- Anatomy and Variations of the Posterior Superior Alveolar Nerve/Artery. Hard Palate: Anatomy and Variations of the Greater Palatine Foramen -- Anatomy and Variations of the Incisive Foramen -- Variant Anatomy of the Torus Palatinus. Lingual Plate and Oral Floor: Anatomy and Variations of the Submandibular Fossa -- Anatomy and Variations of the Sublingual Space -- Anatomy and Variations of the Lingual Frenulum and Sublingual Surface. Lip: Anatomy and Variations of the Frenula of the Lips -- Anatomy and Variations of the Lips. Temporomandibular Joint: Anatomy and Variations of the Temporomandicular Joint. Teeth: Variations in the Number of Teeth -- Tooth Anatomy and Variants -- Abnormal Tooth Eruption.