White substances may be bacterial colonies , fungus, or relining material. Implementation of proper wound and denture cleaning is advised.
This morning when I woke up I noticed I also have a yellowish drainage. It's gone now but it was pooled in my mouth when I woke up. Does this mean infection?
yellow liquid from tissue is generally pus, if not from food or drink. Going back to your dentist to have a post-op exam is advised.