While there are many online recipes for toothpaste, trust me when i say that you don't want to go there.
Toms of Maine is a really good responsible company that has a line of all natural toothpastes. Best of all, if you take the plastic cap off when you are finished, you can
recycle the tubes with your aluminum cans.
I also use a little
squeezer on my tubes so i can get every little last drop out before it hits the recycling bin.
PROS: Less nausea with toothpaste, less landfill space used by using a recyclable product, less time than making your own toothpaste
CONS: Compared to the homemade stuff, very few