I had the procedure done about 5 years ago and I'm down to one implant left. After the other 3 failed, I can say that one of them was my fault but the others I just feel were not seated properly and from what I researched I think 2 of my implants the dentist burned the bones so they inevitably failed. In fact the 1st one failed within 6 months and I knew walking out the day of the procedure something wasn't right with it but I was told it was just "healing".
The denture itself is not very good. Again, I fault this due to a low paid lab worker, who is probably texting while he makes the denture. It clearly did not fit properly, too much in one area, too little in another. I am glad that I have had a partial for years and an upper for years, as I know what can be done to alleviate the pressure points. I had to remove material in several spots on the lower edges of the denture, to keep it from bruising my gums.
Teeth can fall out for a number of reasons, ranging from genetics to drug abuse. Most commonly, teeth are removed or fall out on their own due to severe tooth decay. Neglect to upkeep oral hygiene or not seeking proper treatment for damaged teeth, can lead to the onset of decay which in turn leads to loss of teeth. Visiting you dentist in 6 month intervals is a good preventive measure to spot any early signs of decay.