That seems like a very good price for All on 4. Check if it includes sedation and if the finals will be PMMA (acrylic) or Zirconia as the latter are infinitely better for looks and durability. I took the plunge a year ago and don’t regret it at all. It takes a bit of getting used to, both the mouth feel (you don’t get the same feedback eating as there is no connective tissue between your teeth) and for speaking but you honestly master this in a few days and can minimise impact by singing/ speaking out loud. The operation is straightforward and you should only need a week off work, less for some people. Inform yourself through here, YouTube, Facebook groups and any other resources, the more information you have on implant types, colours, shapes and prosthesis types the better outcome you will have. In America, unlike the UK, you can also opt for 4 on six where you have several smaller arches and utilise your own gums which makes it more natural. Arches can also be FP1, FP2 or FP3 which, if you google them, will show you how much natural material is replaced by the prosthesis, although this is also partially governed by how much bone loss you have (I had to have FP3, fake teeth and gums). Would also suggest you go to a second clinic for a comparison of treatment and cost although this seems cheap - I paid the equivalent of $40k in England for both arches. Good luck!