Wedding-day white teeth! My dentist actually told me about this. Use a little toothpaste, mix in one teaspoon baking soda plus one teaspoon of hydrogen peroxide, half a teaspoon water. Thoroughly mix then brush your teeth for two minutes. Remember to do it once a week until you have reached the results you want. Once your teeth are good and white, limit yourself to using the whitening treatment once every month or two.
Remove urine stains (from potty training or pets) from a mattress, upholstered furniture, carpet, etc. Pour 8 oz. hydrogen peroxide into a measuring cup, add 3T baking soda and stir till dissolved. Pour into a spray bottle, add a drop or two of dishwashing soap (Dawn, Palmolive, etc). Shake it up then spray it on the stained area. When it dries, the stain should be gone. (Test in an inconspicuous place first to be sure the solution doesn't remove the color from the fabric.)