It took me a ridiculously long time to notice that indicator toothbrushes don't indicate anything if you use baking powder instead of toothpaste. The colored bristles must react to fluoride or something. Anyway, they don't react to baking soda. My brush can be frayed as anything and the blue bristles are just as blue and pretty as when I bought it.
This is an opportunity! Arm & Hammer need to get on the stick! Indicator toothbrushes for those who prefer baking soda! Granted, there are only about seven of us, but c'mon! We're suckers; we'll pay top dollar. You'll make a fortune!:)
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