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I will start off by saying that although tonsils sometimes have foul odor, it is not clear
to what extent this causes bad breath. In some individuals, small deposits of calcified
material (bacteria and their debris, in particular) accumulate in small cavities (crypts)
on the surface of the tonsils. These deposits break away from the tonsils, and are coughed
up as little stones. The medical term for these stones is "tonsillolith". These
stones smell like hell (in fact their odor is similar to that coming from infected gums).
People who cough up these stones and then smell them are sure that their breath smells as
bad as these stones. According to my experience, this is not the case. Rather, having
smelly tonsilloliths often causes people to spend years, wrongly assuming that they must
have bad breath. In any case, tonsilloliths can be alleviated by a medical treatment known
as laser cryptolysis, in which the crypts are lased. However, since in many cases the
tonsilloliths themselves do not necessarily constitute a medical problem, I am not
convinced that everyone with tonsilloliths needs to undergo this procedure. Please keep in
mind that I am not a medical doctor, and that if you are concerned about this problem, you
should speak to a qualified physician.