Treatment options depend on several factors (for example: if you have any natural teeth, the level of bone remaining in your mouth, bone quality/quantity, your tissue, age, health, etc.)
When teeth are missing, the gums and bone beneath constantly change. Wearing older dentures can cause the lips and cheeks to sag, making you look aged.
Aside from focusing on the aesthetics, the health of your mouth affects the well-being of your entire body. Proper health cannot be maintained without proper nutrition and digestion. Loose dentures and sore gums make it more difficult to chew and maintain a healthy diet.