Objective: Use strawberries and baking soda to whiten teeth

Which of the following solutions is more sound in terms of naive physics reasoning?

Options are:
[A]. A paste made from mushed up strawberries and instant yeast helps to clear away surface stains and remove plaque. Simply brush the paste onto your teeth with a toothbrush for several minutes, then rinse away.;
[B]. A paste made from mushed up strawberries and baking soda helps to clear away surface stains and remove plaque. Simply brush the paste onto your teeth with a toothbrush for several minutes, then rinse away.;
[B].