A Fool and His Money part of the Leather Pushers film series. May be actually titled A Fool and Honey

The first film in the first "Leather Pushers" series from Universal.

On the steamer going over to London the "Kid" falls in love with a senator's daughter and his manager is too sick to keep him in any training. After a week or two of training the "Kid" enters the ring only to find that his rival is one of his sparring partners. Knowing all the "Kid's" punches the opponent scores many points during the combat but suffers a punch in the jaw which loosens a tooth. The "Kid" waits for the moment when the terrible fighter must turn his head to spit out the tooth before he gives him the final knock-out punch.