Can you say if it could lack of protein create bone loss in your teeth?

Decalcification: Or loss of calcium in your teeth is what i think you are referring to. This is much more commonly associated with acidity in the mouth most commonly caused by bacterial metabolism of sugar or oral exposure to stomach acid. If extreme protein deficiency causes a change in oral acidity, it is possible but there are many more likely causes.

Need protein : A good diet is important for our body.. A diet that is too low in protein will have an effect on your immune system and cause muscle weakness. Every cell in your body needs proteins to function.

Your ? is unclear: Teeth once formed and erupted are not affected by nutritional deficiencies. They may be affected as they are developing in your jaws but I have not seen or heard of this personally. Nutrition does play a major role in the health of bone that surrounds and supports your teeth. Perhaps repost your question if this does not answer your question.