Tear troughs are a complex and difficult area to treat. Initially I was going to answer about how we treat the tear trough with dermal filler in the tear trough and cheek but then I re-read your question and you mention tear trough lines.
What is a tear trough and how do we treat this area?
If you have a true tear trough, as shown in the photo below, you can treat this area with dermal filler to reduce the depth of the trough. We often treat the mid-cheek and tear trough at the same time to reduce the hollows under the eyes and you may need 2ml of dermal filler to treat this area. Have a read of our cost page for an idea of how much we charge per vial.