-Communicable disease
-Susceptibility to infection
-Restricted sodium diet (paste has high sodium content) -Respiratory conditions (asthma, emphysema, cystic fibrosis, etc.) -Difficulty swallowing
-Primary teeth
-Lack of stain
-Recession
-Restorative materials (easily scratched)
-Newly erupted teeth
-Demineralization
-Hypomineralization (amelogenesis imperfecta)
-Inflamed gingiva