I have yet to try this, so I can't verify if it works, but found the article interesting nonetheless. Of course I do brush my teeth at least once a day, if not more, and don't have a weight problem:

Courtesy of Drweil.com

Can brushing help you lose weight?

If you are trying to maintain a healthy weight you may want to try brushing. A study published in the Journal of the Japan Society for the Study of Obesity found that people who brush their teeth after every meal tend to remain slimmer than those who don't brush as often. Japanese researchers discovered this effect when they compared the lifestyle habits of nearly 14,000 people whose average age was the mid-forties. They concluded that tooth brushing is a good health habit that could play a role in preventing obesity. I have long suggested brushing your teeth at least twice a day, accompanied by daily flossing, to help prevent the buildup of small amounts of food that attract and nourish bacteria. So if gingivitis, cavities, or bad breath weren't enough of a reason to brush and floss, consider becoming a slimmer you!

Of course obesity is rarely seen in Japan, so maybe it does work??