They can use gums to gum food. Mine only has 2 teeth and she takes a variety of fruits, bread, pancakes, muffins, scrambled eggs etc... If yours does not like to chew, perhaps yoghurt?
they can eat anything even though no teeth. their gums are strong enough to chew.
Egg, bread, pancakes... need to encourage chewing even no teeth
cereal , brown rice ,oat meal .. porridge
Oatmeal?