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Its back again at woolworths, last time i think it was at this price was September 2017. I have never seen at coles at $1 but did found a post for spudshed once.
Mouthwash is pointless. Have you ever wondered why dentists just give you water to rinse your mouth after poking prodding and drilling? Floss, brush your teeth and move on. The fewer chemicals in your mouth the better.