Some DIY dry shampoo recipes use baking soda instead of arrowroot powder.
In fact, the first DIY dry shampoo I made was with baking soda.
While I was satisfied with how it worked, I found out that extended and intensive use of baking soda can damage your hair.
This is because the scalp has a pH* level of 5.5, and the hair shaft has a pH level of 3.67. (1)
Baking soda (sodium bentonite) has a pH level of 9.
A study found that products with a pH higher than 5.5 may increase friction, cause frizz, hair breakage, and enhance hair tangling.
Ingredients with a high pH effectively remove buildup and dry out the scalp if it’s too oily.
However, long-term use can also strip your hair of its natural oils and irritate the scalp.
Maintaining a 3.67 – 5.5 balance helps with hair health.