The Hamilton Spectator - - HEALTH - The cop­per IUD: 99-per-cent ef­fec­tive The hor­monal IUD: 99-per-cent ef­fec­tive

Both the cop­per and hor­monal IUD can last 3 to 10 years, are in­serted through the cervix into the uterus and are ac­cept­able for women who have given birth. Works by in­tro­duc­ing a for­eign body into the cervix and uterus, pre­vent­ing preg­nancy by cre­at­ing a hos­tile en­vi­ron­ment $53-$63 at Planned Par­ent­hood Toronto Works by re­leas­ing lev­onorgestrel, which causes the uter­ine lin­ing to be­come thin­ner and cer­vi­cal mu­cous to be­come thicker, mak­ing it hard for sperm to en­ter $306-$380 at Planned Par­ent­hood Toronto Source: So­ci­ety of Ob­ste­tri­cians and Gy­nae­col­o­gists of Canada

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