Diamonds Football 368-018C 5/Pk. The Mydent (Defend) Diamonds Football is a friction grip (FG) bur with coarse diamond grit, designed for efficient and precise tooth preparation in restorative, crown, and bridge procedures. If you're wondering what the Mydent (Defend) Diamonds Football is used for, this is the best Mydent (Defend) Diamonds Football for palatal area preparation and occlusal reduction.