I was just on RedPlum and noticed they had two great coupons for GUM products. One was for $0.75/1 GUM toothbrush and the other was for $0.55/1 GUM Dental Accessory. I'm not sure if these are showing up in all regions, but it's definitely worth checking out here.
The toothbrushes and floss and other dental products often go on sale for $1 or close to $1 at many stores. So if your store doubles, these coupons will make them free. Even if your stores don't double coupons, they'll still be very inexpensive after deducting these coupons.
More printable coupons: