Getting used to the look and feel of dentures
New dentures can feel uncomfortable or loose in the mouth, and it takes time for the muscles of the mouth, cheeks, and tongue to adapt to the presence of new dentures. Some people also experience increased salivation or pain when getting used to new dentures, but these sensations and the learning curve of inserting, removing, and cleaning dentures are eventually overcome.
Dentures are designed to replicate the natural teeth, so they should make little change to your appearance if they are replacing natural teeth. If the dentures are filling in for missing teeth, they will likely improve your appearance.
Adapting to suitable foods
A new denture wearer will need to start with soft food in small pieces, making sure to alternate sides of the mouth when chewing to become fully familiar with the dentures. Gradually, more challenging foods can be undertaken, but it's always wise to avoid hard things such as bones and shells, as well as avoiding sticky foods and chewing gum. And don't use your dentures as nutcrackers!