Pregnancy & Bio Ionic Straightening
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A: The Bio Ionic System is no more harsh on the hair and system than perhaps a standard perm or thio-straightening would be. I've found many references to expectant mothers who have had the service during pregnancy and before with no ill effects.
Regardless of the doctor's okay, I would expect the salon to perform a patch test on you to ensure that you have no sensitivities to the chemicals involved.
Also, if you have to have a retouch service while you are pregnant (results often last for 6-9 months before needing retouch) you should plan a visit to the salon to make sure you haven't developed sensitivity to the chemicals as a result of the chemical/biological changes of being pregnant.
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See also:
Hair straightening
Hair and pregnancy
Can you get just your bangs done with Bio Ionic straightening?
Bio Ionic hair straightening and the use of hair straighteners and curling irons