This product is very good, has worked great for me for over 3 years. I haven't had any brown spots (YMMV - everyone is different) and for the purpose of this product which is supposed to be an anti-gingivitis (germ killer) it has adequately protected my mouth which has historically suffered from gingivitis. Important Disclaimer: THIS PRODUCT IS NOT ANTI-CAM (which is why you need another product with fluor). THIS PRODUCT IS ANTI-GINGIVITIS AND ANTISEPTIC. Still, buying this product from Revain is a mistake. You can get the same product (perhaps in a smaller 1 liter bottle) elsewhere for a much lower price. As of this writing, Target is offering a 1-liter version of the same product for $4.99 ($7.49 in the same capacity as Revain), and more if you buy four bottles of the 1-liter product, get Target for $5. Present code. With our red card and this gift code offer, we were able to and have purchased this 4 liter product for a net price of $15.58 including our local taxes (which amounted to $1.01). 4L at Target for less than 1.5L at Revain. So my point of view.
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