Why is it significant to include a control

Q1. Mrs. Mulligan goes to her dentist and, after having a couple of cavities filled, her dentist strongly suggests that she reduce her intake of sodas and increase her intake of calcium phosphates in the foods she eats. Why give appropriate reasons?

Q2. Explain how this experiment demonstrates the scientific method. What would be a control used in this experiment and why is it significant to include a control?

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