If you want to whiten your teeth safely and inexpensively at home, you definitely need to try this technique. I promise you it works better than some of the commercial whiteners, which are expensive and sometimes make you gag.
I discovered this accidently when I had to get the crown that I had so much trouble with and wrote about in the importance of getting a second opinion needed to come out. The oral surgeon told me to gargle every six hours with one teaspoon of salt to a glass a water to help the healing process after that tooth was removed. I did this treatment for several weeks until my appointment. However, you will start to see an improvement with continued use much sooner than you realize.
I started to notice how bright my smile was becoming. Honestly, I watched how my teeth went whiter much better than anything I tried previously in commercial form.
Even when I finished with that problem, I continued to gargle. I like one teaspoon to a cup of water. This is a bit stronger, but I do this at least once a day. My regular dentist even noticed the beautiful difference and complimented me.