INTRODUCTION AND IMPORTANCE: Oligodontia is a rare genetic condition characterized by more than six congenitally missing teeth, either as an isolated non-syndromic condition or in association with other genetic syndromes. The impact of variants on dental development increases with the presence of the c.321C>A variant and the number of missing teeth. CASE PRESENTATION: A 21-year-old man with non-syndromic oligodontia was diagnosed at 15 years of age with misaligned teeth, speech problems, and the absence of 24 permanent teeth. Interdisciplinary collaboration between specialists was initiated to enable comprehensive treatment. DNA analysis confirmed that the patient was a carrier of the known pathogenic variant c321C>A and variant c.113G>T of unknown clinical significance. CLINICAL DISCUSSION: Dental implants are a common treatment; however, bone development challenges in adolescent patients with non-syndromic oligodontia necessitate careful planning to ensure implant success. Many WNT variants play crucial roles in tooth development and are directly involved in non-syndromic oligodontia, especially the variant c.321C>A. CONCLUSION: A full-arch implant-supported monolithic zirconia screw-retained fixed prosthesis is a viable treatment option for young adults with non-syndromic oligodontia. Further studies are needed to clarify the possible amplifying effect of the variants c321C>A and c.113G>T on the pathogenic phenotype of non-syndromic oligodontia.