Charges against a Mandurah teacher accused of child sex offences have been dropped in Perth Magistrates Court.

The woman, who cannot be named, faced court on Wednesday.

The woman leaving an earlier court appearance. Credit:Richard Polden

She had been charged with six counts of sexual penetration of a child over 16 under her authority and four counts of indecently dealing with a child over 16 under her authority.

It is understood the teacher resigned from a private school in Mandurah after allegations of an inappropriate relationship with a student.

In a letter sent to parents on January 28, the school's principal advised of an "alleged issue relating to child safety".

On Wednesday all charges were dropped, with the prosecution saying it was not in the public interest to pursue them.

Mandurah Mail.