Question

the teeth covered with sticky yellowish layer of food particles and bacteria is called​

Answer 1

Explanation:

If the teeth are not cleaned regularly, they become covered with a sticky, yellowish layer of food particles and bacteria cells called 'Dental Plaque'.

Answer 2

The teeth covered with a "sticky yellowish layer" of food particles and bacteria are called biofilm.

Explanation:

Biofilm is composed of bacteria and it is a film which is sticky in nature. This layer is formed to "protect themselves from other pathogens" and microorganisms.

This layer formation on teeth is not good for health. It may cause gum and tooth damage by germs. Hence it is always recommended to brush the teeth before breakfast in the morning and after dinner in the night.