A patient suffered nerve damage during teeth implant surgery that has impaired his sensitivity and affected his speech, a Dental Council disciplinary hearing was told yesterday. Dr Anthony Tse Siu-kwong faces a professional misconduct charge - that he failed to properly assess the position and depth of the implant prior to the operation. The complainant said the implant had penetrated his nerve. The council heard that Tse implanted two teeth for Yeung Pak-keung on May 3, 2006. Yeung experienced intense pain during the operation, but Tse told him it was normal. Yeung told the council yesterday that he had not experienced pain during two similar operations performed by Tse in 2001 and 2005. 'The drilling started out normal. But as it reached a particular depth, I felt that something had been drilled open. I felt intense pain,' he said. A CT scan carried out by a doctor showed Yeung's nerve had been damaged. One implant had penetrated the nerve, while another had touched it. He went back to Tse, who removed the tooth that had penetrated the nerve, but said there was no need to remove the other. Tse eventually elevated Yeung's second implant by about 2mm. Yeung said his ability to sense cold and heat had been harmed since the implant surgery and that he felt fatigued after talking for long periods. 'Four years on, I still feel something is stuck in my mouth, or that a plaster is pulling my jaw,' he said. The defence said Yeung had demanded Tse pay him compensation of HK$5 million. Tse originally pleaded guilty, but changed his mind 15 minutes before the hearing started. The hearing was adjourned until next Thursday.