Singer Ray J Norwood has threatened Celebrity Big Brother with legal action after he said he was prevented from re-entering the house.
The American artist and songwriter left the reality TV programme on Tuesday after he blacked out over pain caused by a cracked tooth.
Speaking to US website TMZ.com, he said he had been complaining about the pain for "three and a half days".
He said: "It got to the point where some of the housemates in the house felt I was being ignored, we took petitions to say, 'Hey we're not doing any more tasks until Ray J's tooth gets fixed'.
"I've got a cracked tooth where I need a filling fixed, I've got a gum coming over my other tooth. I'm in a lot of pain."
After the show's producers decided to remove him from the house over the pain, Ray J said the wind hit the tooth and he "blacked out".
"I end up in the hospital 45 minutes, they get me a some nutrition and I eat some McDonald's and I'm cool, I'm literally fine, I'm ready to go back in the house and they won't let me back in," he said.
"I'm really hurt by it because I felt like I was doing well. I was having such a good time.
"I felt like I was connecting with the British fan base, British audience.
"What's sad is they won't let me do the show any more they won't let me back in the house it's not fair to me."
The singer claimed he was going to drive himself to the dentist and then return to the house in Elstree Studios and "try and get back in".
Asked if he would sue if he did not receive his reported one million-dollar (£800,000) fee for taking part in the show, he said: "I never like to do that because I'm a producer and I like to be on the same page as everybody, but this is just not fair.
"And if I have to take those precautions I will. I don't even care about my tooth. Put me back in the house and let me work."
The singer and songwriter is best known in the UK for starring in a leaked sex tape with Kim Kardashian, but said he was hoping to change all that when entering the house.
The show confirmed he had left on Twitter.
They said: "Ray J has left the Celebrity Big Brother house and you are no longer able to vote for him.
"Those who have cast votes will be entitled to a refund."
A spokeswoman for the show said more information would be revealed during the programme's spin off, CBB's Bit On The Side, on Tuesday night.
The presenter of Bit On The Side, Rylan Clark, confirmed the news, adding more would be revealed on tomorrow's show.
He described Ray J's departure as "sad".