Perhaps the use of a more selective anti-inflammatory drug, capable of inhibiting enzyme specific for pain may be more effective in preventing the tooth sensitivity caused by the inflammatory response produced by in-office bleaching. To the extent of the authors´ knowledge, no study has so far addressed the use of a selective anti-inflammatory drug specific for pain enzyme on tooth sensitivity, being this the aim of the present investigation.
Inclusion Criteria: * will be included patients 18 years old and over * with good general and oral health * with the eight upper front teeth free of cavities and restorations in the buccal cavity The initial color of those teeth must be C2 or dark, comparing with scale Vita Lumin (Vita Zahnfabrik, Bad Säckingen, Germany) organized in order of value. Exclusion Criteria: * shall be excluded patients who underwent any previous form of bleaching procedure * lactating and pregnant patients * who relates sensitivity * severe dental browning (tetracycline staining, fluorosis or endodontics) * with parafunctional habit or any other type of oral disease Still will be excluded patients who have systemic conditions as stomach problems, heart, kidney and liver, or using any continuous drug with anti-inflammatory and antioxidant action.