I should have added this one www.amazon.co.uk/Dental-Diet-Surprising-between-Life-Changing/dp/1781809305/ref=sr_1_1?dchild=1&keywords=the+dental+diet&tag=mumsnetforu03-21&qid=1611650242&sr=8-1
It is nothing new, since Weston Price already highlighted how crocked teeth , narrow palates, didn't exist before industrial food (white flour, sugar and processed oils) and wrote extensively about it in 1930.
Dr Li's book is very recent and his food suggestions are easier than some of the Weston Price Foundation.
Refined food is damaging to health in many more ways than one thinks, beyond what a multivitamin can fix. A wrong diet will change the facial features and even the bone structure.
Cooking is not hard if your DH is determined and understand that his first role is ensuring health.
He could try making a chicken schnitzel:
3 plates with in this order
1 plate with flour
1 plate with an egg mixed
1 plate with bread crumbs.
Cut chicken breast into stripes, and put one at the time first in flout, then egg, then breadcrumbs and lay on a plate. Add extra virgin olive oil in a pan, heat it up a bit, and put the chicken to cook until brown. a tiny bit of salt, put two kitchen papers on a plate and put chicken on top to remove excess oil.
Later, when accepted you can add some parsley to the bread crumbs.
Industrial food is not plain, far from it, a ton of additives, salt, sugars, and oils are added to make it very tasty. Yet when a parent prepare a vegetable, many won't do much with it and then wonder why a child doesn't like it. Vegetables need to be dressed, seasoned . There is a big difference between a boiled pumpkin cube and roasted pumpkin in the oven with garlic, fresh rosemary, olive oil and coarse salt cooked a quite high temperature.
However, a boiled pumpkin to which one adds good quality butter and salt makes a delicious mash.
It doesn't take much to make vegetables taste nice.
It isn't difficult to cook. It does take time, but difficult , nope