Our 92 year old mother has lost quite a bit of weight and as a result her lower dentures no longer fit well and cause canker sores. She got theses many years ago over existing teeth. She has a discounted dental plan but when I called a local dr. On the plan they said she would need to have her existing teeth extracted. At 92 we really do not want to put her thru this. Anyone have any experience with this type situation?