Dentistry

Dental whitening 1- Enamel Hardness Tooth whitening agents cause a number of adverse effects on the hardness of human enamel ,  making it more susceptible to deformation and fracture . Enamel specimens exposed  to 7.5% HP exhibit a significant reduction in enamel hardness, is explained by the oxidation process   that the organic and inorganic components of enamel undergo when exposed to whitening  agents.   This leads to changes in enamel morphology by the development of porosities and  micro-cracks, ultimately causing a reduction in hardness. Whitening agents with acidic pH cause greater reductions in hardness when compared to products with neutral or slightly alkaline pH . Research has also revealed that whitening using two 10% CP products with pHs 6.79 and 6.23 for 8hrs/day for a duration of 14 days have resulted in no significant changes in enamel hardness.   All studies reported had artificial saliva as a storage medium for whitened enamel to provide samples with an opportun