Calm down, this is totally normal. They are the only fish that I am aware of that periodically (monthly to bi-monthly) changes ALL its teeth at the same time. They will all fall out and be replaced within a couple of days. If they are all gone and you can already see white stubs, it means that the new ones are pushing the surface and will be perfect in a day or two. It may not be particularly hungry until this tooth replacement process is near complete. Good to see that you are alert to changes in your fish.