Whiter Teeth: Baking Soda and Lemon... This may be one of the most popular of the natural teeth whitening home remedies. The chemical reaction of baking soda with the citrus of lemon juice has a smile-brightening effect. Either one of these ingredients works well, but together they are super-effective. Hair Beauty, Make Up, Beauty Secrets, Body Care, Teething, Makeup, Diy Beauty, Teeth, Tips