Aerosol masks for medical use; Face masks for use by dental care providers; Face masks for use by health care providers; Human face protectors, namely, transparent face shields for use in the medical and dental fields; Masks for inhaling pharmaceutical preparations; Masks for use by medical personnel; Oxygen masks for medical purposes; Oxygen masks for medical use; Respiratory masks for artificial respiration; Respiratory masks for medical purposes; Sanitary masks for dental use; Sanitary masks for dust isolation for medical purposes; Sanitary masks for dust prevention for medical purposes; Sanitary masks for fungus isolation purposes; Sanitary masks for germ isolation purposes; Sanitary masks for medical purposes; Sanitary masks for medical wellness purposes; Sanitary masks for pollen isolation purposes; Sanitary masks for virus isolation purposes; Surgical masks; sensors for diagnosing and for feedback with respect to pH, inflammatory markers, proteins, blood oxygen percentage, viruses and other infectious agents, chemistry of saliva; X-ray diagnostics, sensors for diagnosing teeth grinding, sleep apnea and other sleep abnormalities, bruxism, teeth occlusion including due to parafunctional habits; sensors for diagnosing abnormal breathing issues; orthodontic products