A brighter smile may be just a click away — and right now, Walmart shoppers can score the MySmile Deluxe Teeth Whitening Pen Kit for just $27. Coffee lovers, red wine enthusiasts and anyone who’s ever caught their reflection after a long week of iced lattes know the struggle: teeth stains have a way of sneaking up on you. Professional whitening treatments can cost hundreds of dollars, which is why at-home kits continue to attract attention. Enter the MySmile Deluxe Teeth Whitening Pen Kit , a