Quackery is dangerous to the person because wrong procedure or medication may be given that will cause life-threathening conditions. Hope it helps. :)
Quakery is very dangerous to a person which doesnt know his/her being expose to a very unprocedure medications which she/he believes that it could cure,but it could make it worse and more bacterial infection.Unsanitary procedures done can cause illness or even death to a person so,it must be professional only should handle it.
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