When using fuel injector cleaner it's recommended that you add a bottle of fuel injector cleaner to your full gas tank after every second fill up of gasoline.
So every other fill up of gasoline in the gas tank on your vehicle you should dump a bottle of fuel injector cleaner into the gas tank.
The fuel injector cleaner will help keep your fuel injectors clean and prevent them from becoming clogged which can cause problems such as hesitation, stalling, misfires etc.
I always add a bottle of fuel injector cleaner to my gas tank every other fill up and haven't had any issues with the fuel injectors becoming clogged or dirty.
The vehicles have run fine and never had any problems with the fuel system when regularly adding fuel injector cleaner.