Having complete dentures helps with chewing as well as support one's facial structure and improves speech. Complete dentures can be fabricated and inserted following the removal of your few remaining teeth. However, if you need many teeth extracted at the same time you may need to have interim immediate dentures placed. Then when your gums and bone have a chance to heal and remodel you can have your custom fitted final dentures fabricated.
Sometimes, complete dentures are not necessary .In situations where you have some sturdy teeth remaining then partial dentures can be made to replace the teeth that you have lost. Partial dentures achieve adequate retention and stability by being clasped to the teeth next to the areas where others have been extracted or are missing.