Three months ago, I wrote a review about Nano-b Anti-Bacterial toothbrush and this is my follow up. I used the Charcoal & Gold toothbrush for three months and now I am using the Silver toothbrush. The difference between Charcoal & Gold and the Silver toothbrushes is that Charcoal & Gold is great for anyone looking to whiten teeth and remove stains whilst the silver eliminates 99.9% of bacteria on the brush, and is their best bacteria fighter.