Can gumlines that was pushed down a little through brushing can this get better naturally or would it have to get treated?

Not really: Gums that have receded through vigorous brushing don't normally grow back to their previous position. As the gums receded, so did the bone. Bone will not grow back in this instance. Ask your dentist if treatment is necessary.

Gum recession: If you recently were too aggressive with a toothbrush and irritated the marginal gingiva (gums) to cause some slight recession, the gums will probably grow back. However, generalized long term gum recession requires grafting by a periodontist to restore the gum line to its original position. However, not all recession requires treatment. Discuss your particular situation with your dentist.

Evaluate Parameters: It may improve if ti just happened. If it has been there awhile, it needs to be seen by a periodontist to evaluate you for gum grafts/soft tissue grafts. Evaluation will include how much recession, how much gum remains, the condition of the gum that remains, and if there is any root or gum sensitivity.