Study Design Patients will be divided into two groups (n = 60 ), GC (control group) and GE (group experimental ). At the initial consultation volunteers will be asked about smoking habits daily. Patients who do not smoke will be part of the GC, and heavy smokers (more than 10 day ) will be part of GE.A cigarettes all smokers are complementary be given a booklet of tips for quitting smoking and damage, and sites where to find more information. (Annex C ) The teeth whitening technique selected for this study, is the technique of home bleaching, validated for both groups. Treatment and follow-up will no cost to the patient . For the development of individual buckets, this will be through impression of the upper and lower arch of each patient Jeltrate Plus alginate ( Dentply, Petrópolis, Rio de Janeiro, Brazil), the molds will be cast in plaster and immediately after printing. After obtaining this plaster model is cut and taken to the vacuum laminator ( Protécni, Araraquara, Sao Paulo, Brazil) for making buckets individual vinyl acetate 1 mm thick (Plate Pail Whiteness -FGM, Joinville, Santa Catarina, Brazil). Cuvettes acetate be cut an inch margin on gingival . For both groups of PC gel will be used 10% ( Whiteness Perfect, FGM, Joinville, Santa Catarina, Brazil ), for a period of 3 hours a day for three weeks ) . After the test cuvette acetate individual, the method of application of the product will be carefully explained to each patient in the study as follows : Dispense a drop in the region of the product corresponding to the buccal surface of each tooth in the tray. The amount of gel should be sufficient to remain in contact with the buccal tooth surface without covering the gingival third, preventing injuries from it. After this period, patients will be instructed to withdraw the tray with the whitening gel and perform vigorous mouth rinsed with water to complete removal of the product.