Do you have constant clogs in your line? Does your sink or tub drain very slow or makes sounds? You may not only have things in your line causing this, but you may have damage from it as well. Pressure can build if the flow is impeded and this pressure might cause weak areas in the pipes to crack or burst.
A video drain line inspection can observe the pipes from within by using a special waterproof camera that go around bends in your pipes and display the picture to see where the cause of the clogs or leaks are.