I asked my grandmother some advice about how to solve these problems. She told me that in the ancient day we don't have any dangerous products like this,but they used some hers in their daily life such as use limes to clean their utensils and bergamots in our toilets to remove bad odor. One thing that my grandmother has presented me to do the exeriment is Betel leaves,because she has chewed it and she found that her mouth was clean and her teeth became white.