I assumed the developing cream would bleach the brow as well but it doesn't so with dark brows, you have to bleach them first before you can do any colouring to it.
Will be updating this again to see how I get along after bleaching them.

[gifted from influenster and poligrip]
I am so glad to get these Poligrip Pro Guard cleansers for my retainers.
Just like teeth, retainers need a good clean too.
It is pretty straight forward to use as you just put your retainers in a glass/cup of warm water and add one tablet which will dissolve by itself.
Leave it there for 3-5 minutes and you simply rinse off by brushing it with a toothbrush.
Overall, I was impressed that Poligrip Pro Guard was easy to use and gave my retainers a good clean.