What is the difference between a all on four dental implants and denture? Does the all on four show the gum line when you smile?

There are many differencesDenture - Plastic teeth rest on your gums and move when you chewAll on 4 - The teeth rest on the implants and there is no movement when you chewDenture - You continue to lose bone and the denture will become more loose over timeAll on 4 - The implants maintain the boneDenture - Covers a lot of the mouthAll on 4 - Minimal coverageDenture - Chewing efficiency not as goodAll on 4 - Chewing efficiency very good Denture - loss of bone causes loss of facial supportAll on 4 - maintains facial supportHope that answers your questions. Wish you all the best in your journey

All on four is a minimal option for fixed non-removable tooth replacement. It's very expensive for what you get and better off getting 2-3 implants with a denture on top (removable). The Esthetics are horrible, you will spit when you talk and hiss a lot of air when you try to enunciate certain words. It's a form of under treatment in hopes of saving money and not worth it! Not a fan based on the past 12 years of seeing results from my colleagues. Good luck!