Tear trough filler only possible three times a lifetime?

Hi @honeyk15. No, this is not true. You can have dermal fillers as many times as necessary. I recommend seeking treatments from expert injectors who have the skill and experience to precisely inject fillers into treatment areas and avoid risks and complications. Best of luck, Dr. Nima

I have not seen that multiple treatments of tear troughs with Restylane, Belotero, Volbella or Juvederm have caused any problem with scar tissue, nor have I heard from any colleagues that they limit the number of treatments in the tear troughs. 
The information provided in Dr. Shelton's answer is for educational purposes only and is not intended to constitute medical advice.  The information provided should not be relied upon as a substitute for consultations with a qualified health professional who may be familiar with your individual medical needs

Hello, Thank you for your question. Perhaps he was discussing a specific product. Having filler under the eyes can be done as much as necessary. You shouldn’t have any problems with this treatment as long as it’s performed by an experienced physician when needed. Good luck!