Does anybody have experience of the all on four implants? Today I had a consultation with a dentist. She told me there are two choices for the all on four implants. The choices are acrylic and ceramic.\n\nShe told me people who go for the acrylic all on four implants normally get them replaced about every 3 years. Is that true? I thought the all on four was fitted for life? I have seen dentists who offer a lifetime guarantee for the all on four.