The key difference between All-on-4 and All-on-6 dental implants is the number of implants used. While not necessary for every patient, All-on-6 may be recommended for a more stable and durable foundation for the dental arch. The additional implants help distribute the pressure of chewing and biting more evenly, extending the lifespan of each arch and reducing the risk of further oral health issues. Moreover, these extra implants can enhance jawbone strength and stability, preventing future deterioration.