 [ Symptoms ] what are some stretching exercises [ Disease ] over time dentures will need to be relined rebased or remade due to normal wear natural age related changes to your face jaw bones and gums or if the dentures become loose to reline or rebase a denture the dentist or prosthodontist refits the denture base or makes a new denture base and reuses the existing teeth generally complete dentures should be used for 5 to 7 years before a replacement is necessary