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Garlic (Allium sativum) has been used for traditional medicine since ages. It has many uses such as an antioxidant, antiseptic, anti-viral, anti-fungal, anti-cancer, anti-aging, reduce the risk of heart disease, and antibacterial1. Aim: This study was designed to evaluate the inhibition and eradication ability for garlic against Streptococcus mutans, the bacteria that cause dental caries. Methods: Garlic extract was obtained from Ciwidey garlic maseration process in etanol 96%. MIC was a test to measure the inhibition ability of garlic extract against Streptococcus mutans in planktonic form, and MBIC in biofilms form. MBEC was a test to measure the eradication ability of garlic extract against Streptococcus mutans in biofilms form. Statistic analysis using ANOVA followed by post hoc with  ρ value <0.05. Results: The garlic extract showed MIC value at 9.39 % and MBIC value at 37.5 % but was not observed to have eradication activity against Streptococcus mutans in biofilms form up to concentration 37.5%. Conclusion: Garlic extract inhibit Streptococcus mutans both in planktonic and biofilm form. Garlic extract has no eradication activity against Streptococcus mutans in biofilms form up to concentration 37.5%.