الفهرس 
Review of literature.Only 14 pages are availabe for public view
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Abstract
Dentine hypersensitivity (DH) is considered the oldest chief complain and it is a major problem worldwide in which people are seeking for solutions. It is defined as a transient sharp pain that is produced from bare dentin and opened dentinal tubules (DT). Hypersensitivity could be a result of abrasion, erosion, abrfaction or gingival recession, this process is characterized by the displacement of the gingival margin apically towards the cement-enamel junction thereby exposing the cementum into the oral cavity, which could be easily chipped away due to mechanical forces or erosion with acids, exposing the root dentine with opened DT.
There are many methods to reduce DH, either “at Home” or “In Office”, and one of these methods is a novel toothpaste containing CSSP is firstly been introduced as a remineralizing toothpaste for initially demineralized enamel, by formation of HA on the enamel surface, so, this could be a benefit by application of this toothpaste on dentine in patients suffering from DH. It was said that the precipitates of HA on dentin surface and within the dentinal tubules, can occlude the dentinal tubules and resist the acid erosion with up to 600 seconds immersed in acids.
Moreover, one of the novel toothpastes used nowadays is the charcoal toothpastes, it was found that the abrasive property of the charcoal particles could make tooth wear by its star shaped irregular particles and affects dentin surface morphology, it was said that particle size found in charcoal toothpaste was larger than that found in a conventional toothpaste, furthermore, it may aid in reducing hypersensitivity by blocking the DT and formation of precipitates on dentine surface as it was claimed that it has a remineralization action.
Studies show that consumption of soft drinks is one of the major causes that lead to dental erosion and subsequently increasing DH, so, an acidic soft drink challenge was made on the specimen using PEPSI, to test the efficiency of the precipitates made by the two toothpastes if it will be lost or not.
So, the aim of this research was to compare the Black charcoal containing toothpaste versus that containing Calcium silicate and sodium phosphate (CSSP) in occluding DT and to evaluate their efficacy to withstand acidic soft drink challenge, aiming to investigate their possible efficacy in reducing DH, this was carried out through SEM-EDAX.