About Dental

I have lost my four teeth from the front row in an accident.I am now 21 year old.I need a permanent replacement for my teeth.Currently i cant afford a dental implantation.So i go for a bridge.All i want to know is will this bridge lasts for a long time? Any discomforts(Shaking,Byte problems)will come? Can i replace it with a dental implantation in the future?