Does anyone have tips/information on good health care systems to choose? I heard that once you sign up for one you can't change for 2 years. I also heard some have age restrictions. I also heard some are health organizations and others are more like clearing houses or logistics systems that utilize various hospitals and organizations resources? We have a 66 year old, a 56 year old, and a 13 year old in our family. We have cedulas. I am also interested in how good the dental plans or dental care is here, has anyone experienced that?