Whiten Teeth
The use of baking soda or hydrogen peroxide as teeth whiteners is not just a rumor, It actually works really, really well. Hydrogen peroxide can restore the lost glory of your teeth. Depending on your choice and comfort, you could swish a solution of hydrogen peroxide with water in the mouth before spitting or by soaking your toothbrush in the reagent and brushing for about 2 minutes.
The swish is akin to using mouthwash. A better result is obtained by repeating the process accordingly for a little over a week. While it might not make your teeth and gums healthier, it will bring back that white spark you had before you started drinking all that coffee just to get through the day.