Baking powder/soda may to help whiten your teeth. However, it is an abrasive that may ware down your enamel on your teeth. This may cause more damage to your over all dental health. Before using baking powder or any home remedies you should consult your local dentist to make sure that you will not be doing more harm than good.
If you are not seeing a regular dentist or do not have dental insurance enter your zip code at http://www.californiadentalinsurance.com/ and locate a dental plan that has next day services.
I hope this dental insurance information has helped you.