Sound is formulated into meaningful speech by the articulation of the tongue, lips, teeth, alveolus, hard palate and frenum. Denture insertion can lead to disturbed pronunciation. The phonetic adaptation of a patient with complete denture is achieved by selection and placing of the artificial teeth; thickness of maxillary prosthetic base in the frontal area; optimal space for the tongue; individual adaptation capacity; patients' sound recognizing capacity. Phonetics and proper functioning of denture can be improved by guiding fabrication of denture with the help of patient's phonetics. Verification of proper phonetics in try-in stage and after denture delivery should be done with utmost care. Post insertion follow up should be done. Phonetics is a fundamental feature of prosthetic rehabilitation and, if not adequately considered in the treatment plan for a fixed or removable reconstruction, satisfactory results cannot be obtained. This book provides an insight on the importance of phonetics in complete denture with recent advances in the field.