How can the urge to look at dancers on television screens be overcome?

Among the things that help in lowering the gaze is the feeling that it is an obligation from Allah, Who created the eyes and blessed us with them. Also, feeling Allah's constant watchfulness and His knowledge of the treachery of the eyes, and that the eye is the heart's guide, so unleashing it leads to desiring forbidden things and perhaps even committing them. Additionally, frequent voluntary fasting and studying books of encouragement and deterrence (targhib and tarhib) are helpful. And for whoever falls into sin, they must hasten to repentance by feeling remorse, desisting from the sin, and resolving not to return to it.