Jason Morris, 29, and Samantha Court, 28, used the drug at their home in Horwich, near Bolton, Greater Manchester.

Mr Morris denies grievous bodily harm

Paul Treble, prosecuting, told Bolton Crown Court: "GHB is at the core of this case."

I walked into something that was horrific - I saw a mirror on the floor with some pliers and some teeth and a bowl Joanne Kitchen, prosecution witness

The court, which is sitting at Bury, was told Miss Court was found in her bed covered in blood in the early hours of 16 April.

Mr Morris was talking about his girlfriend's body being dressed in a clown's costume and a witch taking her away through a wall.

Mr Treble told the jury that GHB was an anaesthetic which could result in hallucinations if taken in large doses.

He said paramedics had already been called to the home earlier in the evening, but had left once the couple had calmed down.

'Open your mouth'

He said a neighbour later heard Mr Morris repeatedly saying "open your mouth", followed by what appeared to be Miss Court's mumbling.

He alleged this was Mr Morris pulling out his girlfriend's teeth with pliers and placing them in a bowl.

The jury heard he had then phoned his friend Joanne Kitchen asking for help.

She told the court: "I walked into something that was horrific. I saw a mirror on the floor with some pliers and some teeth and a bowl."

The case continues.