Method: Selected 2 niti wire: Abzil and Forestadent with 20mm length and were divided into 3 groups ( control, fluoride and kapo). First it has been analyzed the pH of the fluoride and the kapo, after the fluoride group was immersion 1 hour in acidulate phosphate fluoride 1,23% ( Flúor Gel DFL ®) and the group kapo was immersion 1 hour in orange juice (Kapo - coca cola®). Used Scanning Electron Microscope (SEM), Anova and Tukey test ( p< 0,05), were used to analyse the groups.
Result: Obtained as a result more corrosion with group kapo in the properties Titanium .
Conclusion: The alterations in this study fluoride and kapo with acide pH , change the wire properties in both wires ( Abzil and Forestadent) and patients in orthodontic treatment with a diet with acidic pH or use of fluoride mouthwash can cause corrosion in the properties of Niti wires used in its treatment.