The US-developed NITE WHITE system is an efficient, painless, easy and safe method of tooth whitening to be used at home. This technique allows even very dark teeth to be whitened, whether live or dead, even if discoloration is caused by coffee, tea, red wine, smoking or is of a genetic origin to be whitened. The active product is a gel with a pleasant mint or cherry flavour. The procedure consists of the following steps: The dentist takes the impression of the patient's dental arch, Then a special overlay on the teeth (like a shield), perfectly matching the patient's teeth, in prepared in our laboratory, During the next visit the patient is provided with the overlays and syringes with the bleaching gel, together with detailed instructions for use. The professional tooth fluoridation after completion of the treatment is of great benefit. Usually the results of the treatment may be apparent after the first night; however, to obtain a permanent effect, the whitening procedure should be continued for 10-14 days. Generally the procedure does not need to be repeated; however, if slight darkening of the teeth occurs after some time, a repeat procedure may be performed after 6-12 months, involving wearing the overlay for 1-2 nights.