One reason why we need mouthwash after eating is that enamel of our teeth will demineralize after some time and we start to experience sensitivity to cold and heat. It becomes worse when the teeth has cavities.
LivingTheNourishedLife blog shares an easy and safe way how to make mouthwash at home. It uses natural products, so there is no harmful chemicals found in store bought products.
Click the link below for the full steps:
http://www.livingthenourishedlife.com/2013/09/homemade-mouthwash-recipe-for-whitening-and-remineralizing