The aim of this study was to examine the effects of a 10% carbamide peroxide bleaching gel (VivaStyle, Ivoclar Vivadent, Schaan, Liechtenstein) on periodontal health. Ten participants, 22 to 29 years of age, with clinically healthy periodontal tissues and a wish to change the shade of their teeth, participated in this study. Subjects were treated with 10% carbamide peroxide for one hour daily during 12 days. The volunteers were instructed to keep a diary of possible disturbances during the teeth whitening procedure. At baseline, on 6th and on 12th day API score and PBI score were measured and clinical photograph of teeth in intercuspidation relation was taken. All teeth demonstrated change of at least one shade. There was no change in either plaque accumulation, or gingival inflammation during the teeth whitening procedure. This teeth whitening procedure seems not to have any influence on the periodontal health.