الفهرس 
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Abstract
Under the circumstances of the current study, the following can be concluded:1-There is a decline in the salivary pH after consumption of the three types of beverage.2- Frequent consumption of soft drinks could present a high risk for dental erosion.3- The effect of cola drink on salivary pH lasts longer due to high titratable acidity of phosphoric acid comparing with citric acid in other drinks.4- Saliva and its buffering capacity play a very important role in the protection of enamel from acid attack during and after consumption of soft drinks.5- Saliva with normal buffering capacity and flow rate helps in returning the pH to base line after consumption of soft drinks.Recommendations1- Regular consumption of such drinks should be discouraged.2- Due to presence of phosphoric acid in cola based drinks which have high titratable acidity comparing with malic and citric acid in non cola drinks, consumption of non cola drink causes less harmful effect on tooth structure.Conclusions and Recommendations783- To minimize the harmful effect of soft drink on tooth structure, at least one hour should separate the drink from each other giving time to saliva to buffer the acid attack.4- Research is required to develop an improved understanding of the biological factors that modify the erosion process, most importantly the role of saliva and pellicle formation