Is it ok to brush my teeth with natural soap(made of olive oil & caustic soda)?

Why?: Ok, yes. Effective, no. Use a dentifrice that has been formulated to clean teeth and that contains fluoride to reduce chance of cavities. Look for ADA seal on package. Brush w pea-sized portion of t'paste for 2 full minutes by the clock. Even more important, floss daily. Use soap on your skin, not in your mouth. Use toothpaste in your mouth, not anywhere else.