"i"ve got a secret." did you know people have been brushing their teeth with baking soda for over 100 years? to clean and whiten their teeth and freshen their breath - without harming tooth enamel. which is why arm & hammer launched its first toothpaste formulated with baking soda in 1987. since that time, thousands of dentists have recommended baking soda toothpaste for healthier teeth and gums. so maybe it"s not that big of a secret, after all. try it for yourself!.