You will need:
2 Tbsp dried lemon or orange rind
1/4 cup baking soda
2 Tsp salt

Place rinds in food processor, grind until peel becomes a fine powder. Add baking soda and salt then process a few seconds more until you have a fine powder. Store in an airtight tin or jar. Dip moistened toothbrush into mixture, brush as usual.

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