Charlie Sheen isn't having the best week. The 49-year-old actor is reportedly under investigation for pulling a knife on his dentist while in the chair last Thursday, according to TMZ. Sheen was allegedly under the influence of "rock cocaine" and when the technician tried to give him nitrous oxide ahead of an abscess procedure, he apparently lost it. Sheen's security had to enter the scene along with his dentist and the oral surgeon. Read more http://www.nydailynews.com/entertai...ulling-knife-dentist-report-article-1.1960644
