The primary function of anterior teeth in a complete denture is aesthetics, as they are most visible during speech and smiling, significantly impacting facial appearance and patient confidence. While anterior teeth contribute to phonetics and minor biting, their main role is to restore the natural look of the patient by providing appropriate shape, size, and arrangement. Proper positioning of anterior teeth also supports lip contours and facial musculature, enhancing overall facial harmony. Therefore, the emphasis on anterior teeth in complete dentures is primarily cosmetic rather than functional.

Reference: Prosthodontics: Complete Dentures, Bhupinder Singh, 2nd Edition.