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Violent blows to the ear can also cause perforation.
Minor tears or perforations can heal up by themselves provided they get the proper treatment. In any case, a doctor should always be consulted!
Information and ideas:
Can be used for illustration purposes on the subject of "Ear diseases" either on transparencies or worksheets. Supposedly "harmless" minor problems can turn into serious damage to the ear.
Relevant for teaching:
Hearing defect/hearing impairment