S ynthetic elastic elastiomeric chain increasingly used in dentistry, especially in the field of orthodontics. Elastic synthetic are often used to improve the position or state of the misplace tooth. Elastic material in the mouth can change its elasticity because of the influence of time and food and beverage. Today there are more variety of food and beverage. There are wide selection of foods and beverages with high acidity, such as orange juice and strawberry juice. People often consume orange and strawberries directly. This causes the acidic nature of orange in direct contact with teeth in a long time. This study analyze the elasticity or flexibility ofS) nthetic elastic immersed in a solution with pH 4. There are three groups of samples, each group consisted of 30 samples. First served as control immersed in water with pH of 7. Second group soaked strawberry juice with s pH of 4 and the third group soaked in orange juice with a pH of 4. Strawberry and orange powder that was used was taken from the ready to use packaging. These groups were soaked for 30 days and every 3 days of immersion the samples were taken and measured. Wilcoxon statistical test result there are significant differenc.es between the control sample with the sample immersed in the orange and strawberry juice, while the results of Mann-Whitney statistical test showed that there was no significant difference among the samples immersed in water, oranges and strawberry juice.