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Leukoplakia is one of the premalignant lesion in the oral cavity that caused by many chemical materials, bacterial, virus, fungi and also to be supported by condition of the patient. The internal factors are genetic and promoter beside external factors as cigarette and alcohol can influence. Malignant tranformation depend on the type and location of leukoplakia. Recently reported that tenascin protein is the one of caused and lipid composition changes in mucous membrane will cause increasing of permeability and inhibition in the barrier function, that caused of the malignant changes. Furthermore malignant transformation can be examined by the biomolecular approach that can be contribute the most important information for the accurate changes.

Sweet represents the quality of taste pleased by human beings since the birth. However, if the consumption of sucrose in the diet is excessive, it can change the calcium balance of the body. The aim of this study was to know the effect from the increased sucrose concentration toward the content of calcium in tooth of wistar’s rats. The experiment used 21 days-age of male wistar rats with body weight from 45 to50 grams. They were divided into four groups, and each group consisted of 8 rats. Group I got 15% sucrose diet, group II 30%, group III 43% and group IV as a standard diet. Six weeks after treatment, these rats were anesthetized with ether and killed then by decapitation. The lower incisor was separated from jaw, the mass of each fraction was weighted. Atomic Absorption Spectrophotometer (AAS) in mg/g was used to determine the concentration of calcium in wistar’s tooth. One Way Anava test indicated that there were significant differences between group of treatment and the content of calcium in tooth (P < 0.05). TukeyHSD (Honestly Significance Difference) test indicated that there was a significant difference at group diet of sucrose 43% in tooth. It was concluded that the increased concentration of sucrose in diet could affect the decreased content of calcium in tooth of wistar rats.