There are several problems here that need to be addressed.
- Can your cat drink water without problems? If yes, then your assumption that your cat cannot keep food in its mouth is wrong. The correct assumption is that your cat cannot chew food. The solution to this problem is to provide food that has the consistency of paste and can be licked up.
- If your cat cannot drink water or lick paste, then the teeth are probably not the cause. You need to let a vet check where exactly the problem comes from.
- The diet you provide is extremely monotonous. This can lead to malnutrition and deficits in certain vitamins and essential nutrients. The solution is:
- Either you study the nutritional needs of cats and prepare the daily meals from a variety of different ingredients that provide your cat with everything it needs
- Or trust companies who have studied the nutritional needs of cats and buy cat food that provides your cat with everything it needs from them.
Considering that buying and cooking chicken for your cat is not exactly cheap either, the best solution would be buying canned food. Mash the food with a fork before serving it to your cat so the content is soft and can be licked up without the need to chew.
If your cat has general problems keeping anything in its mouth, please consult a vet. If your cat has special nutritional needs, consult your vet for recommended food brands.