Which is worse for you, Soda or Meth? I know what my mum would say. But what does science have to say? According to a recent case study publicized in an issue of General Dentistry, Soda may actually be worse for you. Think about it. It rots your teeth, similar to the side-effects of Meth. But it also makes you fat and heightens your risk of diabetes. If we’re talking purely about dental health, Soda is just as bad for you as Meth or Crack. So think twice before you reach for a sugary Coke.