What are permanent treatment options for lumbar disc diseases, like disc dehydration, bulging, and tear?

Sorry! At this time, nothing will reverse these processes. Some of this is genetic and some is aging. Your best approach is to stay active, exercise regularly, get your rest, avoid unhealthy habits (smoking, over-eating).
There are none. All discs dehydrate with age leading to bulges and tears. These are not rypically diseases. If no pain, don't worry about it. Otherwise, you need to exercise regularly, keep your weight down and do not smoke if you have that habit. Sometimes use of medication can be indicated ranging from over the counter to prescription ones. Getting a good night's sleep on a decent mattress can help.