This document discusses some potential disadvantages of baking soda. It begins by describing common uses of baking soda such as absorbing odors. However, it notes that baking soda is a type of salt that activates when in contact with acid. The document then provides examples of baking soda disadvantages like possible skin irritation if used directly on skin and mentioning that overuse can damage tooth enamel. It recommends moderation and consulting a dentist if using baking soda for oral hygiene. In summary, while baking soda has many uses, overuse or direct contact with skin/teeth can potentially cause harm, so moderation is advised.