A woman has told a Sydney court she could whistle through a gap in her teeth after drilling work, in a case against two people accused of posing as registered dentists.

Key points: Two people have pleaded not guilty to carrying out a restricted dental act

Two people have pleaded not guilty to carrying out a restricted dental act A woman claims she could "whistle" through the gap left in her teeth after dental work

A woman claims she could "whistle" through the gap left in her teeth after dental work The accused also face two counts each of taking patient information when not a registered health practitioner

She described the two people who drilled her tooth as "butchers" and said a "chunk" fell out during the procedure.

Amira Karam made an appointment at Guildford Dental Care in October last year after losing part of a filling.

Ms Karam said a woman named Shareen or Sharon introduced herself as the "filling specialist" and introduced a man with a "salt and pepper" beard as the "crown specialist".

Shirin Ramezani Kharavani and Majid Rahebi have pleaded not guilty to carrying out a restricted dental act.

They also face two counts each of taking patient information when not a registered health practitioner.

Ms Karam told the court a woman examined her and told her she might need root canal work.

She said a woman scratched her gum while taking x-rays and a bearded man had to take over.

He also had to finish off the job after the woman had drilled her broken tooth for around 15 to 20 minutes, and "a chunk fell out".

The whole procedure took up to 50 minutes, and Ms Karam told the court the man was not wearing gloves while he was drilling.

She said she also felt they were pressuring her to get crowns.

"He said if I get my crowns fixed, I would have a better smile because I have got a beautiful face."

The court heard that when she returned for follow-up treatment nine days later, she was seen by a Dr Charley Wang, who was described to her as the "root canal specialist".

'Unfinished treatment'

After taking more x-rays, which she questioned the need for, he told her he could not finish the treatment.

The prosecution told the Court Dr Wang thought there was little chance of root canal treatment succeeding.

Ms Karam said at this point during the follow-up appointment, she "lost the plot", saying "you guys are butchers".

No allegations of misconduct have been made against Dr Wang in these proceedings.

When the woman offered to treat her the next day, Ms Karam said she told them: "I wouldn't want a butcher near my mouth again."

She told the court today: "I could actually whistle through it (the gap between her teeth)".

She said was refunded $300 in cash for the initial treatment and went home.

She said that night she received a call from a man to her mobile phone, which she identified through an app as coming from a business called MJ Dental.

The man who identified himself as MJ or MG said he wanted to speak about what had happened to her tooth at the clinic and offered to fix it or pay to have it fixed elsewhere.

She said the call brought her to tears.

"After I told him I don't want a butcher playing with my mouth, I hung up."

The hearing in the Downing Centre Local Court continues.