A woman says she stopped a man who had already pulled out six of her teeth because she thought he was going to pull out more.

The woman was the first victim to give evidence in the trial of Upper Hutt man Philip Lyle Hansen, who is charged with wounding four women by pulling out their teeth and with rape.

Hansen has pleaded not guilty to 11 charges of wounding with intent to injure four women by extracting their teeth with pliers or attempting to with a screwdriver, rape, wiggling their teeth or cutting their toes, and unlawful sexual connection.

The alleged crimes took place between 1988 and 2011 in various places in the Hutt Valley.

The woman said on Tuesday she had been drinking in the back of Hansen's car when he had produced a pair of pliers and an oily rag, and began removing six of her bottom teeth.

He threw the teeth out the car window.

She said she had to tell her parents she had had an accident when she saw them the next day because she could not hide what had happened.

Hansen later arranged for her to visit a dentist to have all her teeth removed.

"He was determined to have a relationship with a woman who had no teeth. He did not have any teeth himself," a Wellington District Court jury heard the woman say on a police video interview.

He did not want her to have dentures either. She said he had destroyed at least three pairs, even flushing one pair down the toilet.

The woman said he was controlling and manipulative, sexually as well as preventing her from seeing her family, having her head shaved because he did not like her hair or dressing her in short skirts with no underwear.

He had also tried to dig out her wisdom teeth when they came through after she got dentures.

She said it was oral sex Hansen was after which was why he did not want her to have teeth.

She had known Hansen in the 80's and said even now she keeps her teeth close to her.

Crown prosecutor Sally Carter told the jury she hoped they were not squeamish about going to the dentist as there was a bit of evidence about teeth.

She said the women had met Hansen mostly through the Internet.

"Bizarrely he had a fascination with their teeth or rather with them having no teeth at all," she said.

The trial is expected to take two weeks.