Microsurgical endodontics — root canal therapy performed exclusively under operating microscope with rubber dam isolation enforced on every procedure — defines Ocean Microendodontics in Hillcrest's medical corridor at 3330 Third Avenue. Teeth deemed non-restorable on examination — vertical root fractures, severe resorption, perforated furcations — are referred for surgical extraction to oral and maxillofacial offices including McGann Oral Surgery rather than attempting heroic retreatment that the patient will pay for twice. Apicoectomy procedures — surgical root-end resection performed under high magnification with ultrasonic retro-prep and bioceramic root-end fillings — are offered for previously root-canaled teeth that have re-infected near the apex. Combined endodontic-periodontal lesions, where pulpal infection has tracked down a periodontal pocket, get co-managed with practitioners including Peterson Periodontics on a parallel treatment schedule so neither side undermines the other's healing. Retreatment of failed root canals with separated instruments lodged inside the canal system represents the practice's most technically demanding work, requiring ultrasonic file removal under microscope at high magnification before re-cleaning and re-obturating the entire canal.