الفهرس 
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Abstract
Dental caries continues to be a major problem in pediatric dentistry and should receive a significant attention in everyday practice, not only from the standpoint of restorative procedures but also in terms of preventive practice which must be given more consideration.
For the past decades, the use of fluoride was found to be of critical importance for the control and prevention of dental caries in children as well as adults. However, because of the fear from the side effects of excessive fluoride ingestion there was a shift towards a safe non-toxic remineralizing agent. Studies have observed that tea drinking or the use of specific extract of tea may prevent or slowdown the progression of caries.
The aim of the present study was to evaluate and compare the effect of commercially available black and green tea on the remineralization of caries-like lesion. This was conducted through a randomized controlled in vitro study.
The study was carried out on thirty sound extracted for orthodontic purpose premolars. Teeth surfaces were coated with nail varnish except (3mm X4mm) area on the buccal cervical third. The teeth were immersed in a demineralizing solution for 48 hours to produce a subsurface enamel lesion. Each tooth was sectioned in a buccolingual direction to obtain a mesial and a distal half and each half was considered as a specimen. The sixty specimens were then divided into four equal groups.
Specimens in group (I) were stored in artificial saliva at 37C and treated with black tea infusion for 5 minutes 3 times daily for 7 days. Specimens in group (III) were stored in artificial saliva at 37C and treated