I had the same problem as you parents. at sixty years old, i had a lot of missing teeth, so I decided to get implants, but of course as you all know, getting implants is out of price in the US!
So dental tourism ended up being my life savior ... I traveled to Morocco, a beautiful country, that my wife always dreamed of visiting, and got my implants for so much cheaper at the Bennis Dental Center. Dr.Bennis had the best skills and the most up to date dental technology anyone could ask for! I was pleasantly surprised when Dr.Bennis not only took good care of my teeth but also offered us travel packages, on which we visited Marrakech, Rabat and Fes. Overall, it was the best trip my wife and I ever had!
Here is Dr.Bennis' website
www.esthetique-dentaire.com/ it's in french, but just email her in english and she'll personally respond and explain everything to you !
Good luck , let me know if you have any questions !!