 Meanwhile , at Painless Dentistry , the Simpson children are getting their teeth checked . It is discovered Lisa needs braces . When Marge informs Homer , he tells her not to worry about the cost , as the union had won a dental plan during a previous strike . Later , at a meeting of the local chapter of International Brotherhood of Jazz Dancers , Pastry Chefs and Nuclear Technicians , Carl announces that the newest contract requires the union to give up their dental plan in exchange for a free keg of beer for their meeting . Homer slowly comprehends that giving up their dental plan would require him to pay for Lisa 's braces and jumps into action , reminding everyone how their dental plan has helped them all . 
