I brush my teeth using a Sonicare toothbrush and about 1/4 teaspoon of baking soda in the palm of my hand. To that I add about 6 drops of full strength CDS and stir into a paste, then brush for about 3 minutes. Yes, the baking soda will reduce some of the CDS CLO2, but it seems to work. Of course, I rinse my mouth with water when done brushing.
You could also dip a Q-tip into full strength CDS and apply to the area of concern.
Externally on my skin, I have applied very strong CDS (10,000ppm) and it does not bother healthy skin.