I wondered the same so I switched to a natural formula that only has natural sweeteners in it, with a range of other natural substances. Suggest a trip to the health food store – there are a fair few options out there, just pick to taste. I don’t find that they make my teeth feel as clean but it’s a worthwhile trade off.
I’ve also switched to a crystal deodrant stone instead of all the chemicals in normal deodrant. It’s working a treat and it’s summer here in NZ.