What structure to filter microorganisms from the oral cavity?

The structure that helps to filter microorganisms from the oral cavity is the palatine tonsils. These are found on the inner portion of the mouth when opened. The inflammation of the tonsil due to allergies is called tonsillitis which is the inability to swallow inefficiently. 

The name of the instrument that the scientist uses is called a microscope.a microscope is used to view objects which is not visible to the naked eyes