Ramprat is correct. We take risk's every single day. It all depends on what risk you are willing to take. Nothing in life is ever guaranteed. The success of a implant greatly depends on the person being implanted. Like ramprat I am having superb success with my implant. My audi told me it can take a long time for some people to achieve what I have in 4 months with my implant. It surely is not a device suited for every individual. Hence having to be evaluated to determine if a person is a canidate or not.
Experience is the best education one can ever have.