my bunny miffy had his front teeth removed afew months ago, he eats exactly the same as his brother, snuffy, all I do it chop everything up very finely, greens, carrots, baby sweetcorn (not much of the last two though!) even fresh picked grass and dandelions. he eats it with no problems.
i thought hay would be a real problem as i didnt think he would be able to pick up the long pieces, but I feed his super forage (by excel) which is short pieces of dried grass and he can pick this up no problems (i sometimes pick through his poo and i can see whole pieces of this in his poo so I know he is eating it!) He can also fairly easily eat hay cakes from pets at home, which are pure compacted hay, i just crumble them a bit.
as a treat i crumble shredded wheat, which is pure wheat no salt or sugar.