How to fix cheek dent lines? I have these lines under my eyes on the top part of my cheeks. (Photos)

Under eye lines can be permanently corrected with surgery or temporarily camouflaged with fillers (Restylane, Belotero, Volbella).There are great non-surgical options to fill in under eye depressions and hollowness. Using dermal fillers, a liquid eye-lift can be performed. A dermal filler such as Restylane would be placed in the cheek and tear trough to hide the depression or bag underneath your eye.
Surgery would require a fat-repositioning lower lid blepharoplasty. In this surgical procedure, fat from the eye area is moved into the tear trough depression filling the actual depression. 
I hope this helps!

A combination approach will give the most improvement. Fillers, lasers, and microneedling/PRP can improve under the eyes. My patients try to get non surgical treatments to avoid surgery. We use PRP and stem cells there often. I suggest consulting with an expert to develop a treatment plan best suited for your short and long term goals. Best, Dr. Emer

This area, known as a SOOF defect, can be treated with fillers or surgery.  Fillers are temporary but work well in this area.  Tightening procedures help also, especially Profound RF.  Fat transfer is also a great solution and can be permanent.  In your case, a minimally invasive midface lift would be a permanent solution.  Seek out a consult from a surgeon who does both invasive and non-invasive.  Best wishes.