A gummy smile is an aesthetic defect that is manifested by excessive exposure of the gums when speaking and smiling. Treatment depends on aetiology. If the cause is only due to gingival hypertrophy, gingivectomy may be performed. If the crest of the alveolar process is at the same level as the cemento-enamel junction, osteoplasty of the alveolar bone is necessary. The article presents the case report of a patient with a gummy smile treated with alveolar bone process osteoplasty. After interview, physical examination and photographic documentation, treatment was planned. After taking impressions and registering the occlusion, a smile simulation was performed by diagnostic waxing of the models (wax-up), then temporary veneers were made with the use of silicone index (mock-up). Gingivectomy was performed under local anaesthesia and after elevating full thickness mucoperiosteal flap, bone osteoplasty was performed with the use of piezosurgery. Six weeks after the procedure, ultrathin porcelain veneers were made on a lithium disilicate base and veneered with feldspar ceramics. The patient was satisfied with the treatment results.