The first bottle I used was PERICHLOR. pharmacy science
This gave me zombie mouth, black coating on my tongue and teeth. Not a stain as much as gunk on any spot that was not spotless. So the teeth you can not brush, back teeth and under the splint and all the areas you can not reach when first out of the hospital.

My second bottle is PERIDEX, 3M
This is not creating black scum, and not as strong of an after taste.

It costs a few dollars more well worth the cost.
Both are Chlorhexidine Gluconate 0.12%