Teeth whitener: You already know about using baking soda to brush your teeth (and as an added bonus, it gives you fresh breath) but next time try adding some lemon juice. Apply the paste to your teeth with a Q-tip and leave it on for a minute. Then, use your toothbrush to scrub your teeth and rinse. Cheaper than Crest White Strips.
Blackhead treatment: Lemons are naturally antibacterial, so they can help with problem skin. Just slice a lemon, and squeeze the juice on your face. Your blackheads will start to fade, pores shrink and lemon juice brightens the skin.
Elbow and knee bleacher: For elbows or knees that tend to darken (especially in the summer) simply srub them with half of a lemon. It works!
Cleansing wipes: Instead of buying pricey store brands, make your own with a couple drops of lemon and tea tree essential oil in about 6 ounces of distilled water. Great as a toner and cleansing wipe. Ta da!