Saline spray can be isotonic and hypertonic.
An isotonic solution is gentle enough to clear, cleanse and help restore nasal breathing. The salt concentration of 0.9% is the same concentration found naturally in the body. Hypertonic saline has a higher salt concentration than is found in the body.
Isotonic saline solution is a perfect choice for even the most sensitive of noses.
Isotonic solutions are considered safe enough to be used every day and can be used even for the delicate noses of newborns.
Reference:
"Impact of isotonic and hypertonic saline solutions on mucociliary activity in various nasal pathologies: clinical study" https://pubmed.ncbi.nlm.nih.gov/18957157/
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