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