Demi Lovato Knocks Trainer's Front Tooth out During Workout Lovato was training with <br />Jay Glazer at Unbreakable Performance in L.A. when <br />the incident happened. Demi Lovato, via Instagram Lovato shared a video of a toothless Glazer on Instagram. Her powerful punch even caught the <br />attention of professional wrestler and <br />former UFC champion Ronda Rousey. Ronda Rousey, via Instagram As for Glazer's <br />tooth, he said, <br />"I #crazyglued my <br />tooth back in."
