Why is saliva a physiological barrier

Saliva provides an effective barrier against drying and helps limit the penetration of physical irritants, toxins and carcinogens in foods, beverages and tobacco. Saliva contains buffering systems that help neutralize acidic foods and drinks to protect teeth and soft oral tissues from acid attacks.

Explanation:

I hope this helps!

explanation:

for example, code 28039 - excision, tumor, soft tissue of foot or toe, subcutaneous, 1.5 cm or greater, appears before 28043 - excision, tumor, soft tissue of foot or toe, subcutaneous; less than 1.5 cm.

take lots of vitamin c

Explanation:

vitamin c helps to fight bacteria and viruses thereby keeping the immune system strong.