It is one of the most hurt moment when you have to chew the pepper to know how hot it is. The thing about hot peppers is that you can`t tell how spicy they are just by looking at them. It starts with 0 being the mildest and goes over 1,000,000 to indicate the hottest peppers. Though there are dozens of different kinds of peppers, here`s the scoop on the heat index for some of the more widely used types.