Dental caries is a significant public health problem for a large segment of society. Blind people have been described as those who encounter more visual barriers to the receipt of dental care than other people. They may have greater problems accessing dental care or may be at increased risk from dental disease or its treatment.The present study was conducted to assess the caries prevalence, traumatic injuries, levels of oral hygiene and treatment need, in a group of 58 blind children aged (6-15) years. The results were compared with a control group of 58 age and sex matched normal children. The data were collected using the methods and standards recommended by the WHO for oral health survey, 1997.A highly significant difference between study and controls concerning DMFT and dmft, dental caries was higher among normal students compared to blind one. Where as traumatized teeth were higher among blind compared to normal students with a significant difference, a highly significant difference was seen on comparing between blind and normal students concerning plaque and gingival index, while a significant difference was seen for calculus index, one surface filling was needed by 25.9% of 58 control subjects, while only 5.2% of study group needed this type of treatment, less than 7% of the control group required pulp treatment, while 25.9% needed pulp care in the study group.The findings of this study demonstrate that blind subjects have a low prevalence of dental caries, poor oral hygiene, and extensive unmet need for dental treatment. This highly alarming situation requires immediate attention.Key words: Blind, Caries prevalence, Treatment need.

Chemical tests concluded that Zamzam water is absolutely good and suitable for drinking as it has very high percentage of sodium, calcium, magnesium, and many other minerals. The purpose of this study was to test the effect of Zamzam water on the microhardness of permanent teeth enamel.Teeth samples (n= 30) with artificially initiated carious lesions were divided randomly into three groups, study group treated with Zamzam water (n= 10), control positive treated with sodium fluoride (n=10), and control negative treated with deionized water (n=10). Teeth were subjected for microhardness assessment before and after pH cycling and treatment with the three agents.The microhardness of enamel surfaces treated with Zamzam water is shown statistically significant increase in the values following demineralization which was not different from that of sodium fluoride.Zamzam water cause an increase in the microhardness of the enamel surface after pH-cycling.