How often can you use toner on blonde hair?

well u shouldn't unless u r trying to get white hair,

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Toner is a demi permanent color and can be used to tone blonde hair approximately every four weeks, depending upon how often the hair is shampooed. Toner should be used in order to achieve the desired blonde tones. It's not just for obtaining a white color.

**The first answer given to this question is a very good example as to why a professional hairstylist should always be consulted with.