David says in Psalm 3 verse 7:
7 Arise, O Lord;
Save me, O my God!
For You have struck all my enemies on the cheekbone;
You have broken the teeth of the ungodly.
David said, that in the past God had struck his enemies on the cheekbone and thus broken their teeth. He compared his enemies to wild animals whose power is in their teeth, using them to tear their prey. He was giving testimony of how God had disarmed and rendered powerless the enemies in his past. How God had rendered them toothless.
In the first two lines of this verse David expresses trust in God as His Saviour. We can be confident that like David if we are trusting God, He will strike our enemies on the cheekbone and break their teeth. He will render them toothless, powerless, however much noise they make and however much they threaten us.
Our chief enemy is Satan. He makes much noise, he roars ( 1 Peter 5:8), planting thoughts of fear, anxiety, great foreboding in us. But if we are trusting in God we can be sure, like David’s enemies of the past, that thanks to God’s protection in our lives, he is powerless, a toothless enemy.