If you you follow the instructions on how to use your disposal, you will never have any problems. Yup, that's what that little book that comes with the disposal is for.
Also a cleaning tip I use: put ice cubes in the disposal, then sprinkle in baking soda. Pour about a cup of vinegar in...slowly run water while running the disposal. This is a great way to clean and deodorize . The ice cubes actually sharpen the blades.