I use baking soda mixed with a couple of shampoos (baby shampoo and anti-dandruff shampoo, to be precise) on my hair when I'm fading semi-permanent hair dye. I leave it on for about 30-60 minutes and do find it drying (I use a deep moisturizing treatment afterward), but I haven't noticed any damage from it. I guess you could call it an extreme clarifying treatment, at least how I use it.
People use baking soda as a clarifying agent, but in a lesser concentration and a far shorter time limit than I do. Heck, people use baking soda to clean their teeth, either alone or mixed in with their toothpaste--and baking soda has been used for cleaning teeth for decades. There's other uses, such as mixing baking soda with water to form a paste for cleaning one's skin, treating insect bites, getting rid of heartburn, treating mild burns (such as sunburn) and the like.
I think using a dry shampoo containing baking soda will be OK, but if you notice your hair is getting dry from the dry shampoo, use a moisturizing deep treatment the next time you wash your hair. I doubt you'll suffer any long-term damage from using it.
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