A costly taunting penalty by the Cincinnati Bengals' defense allowed the 49ers to extend their lead before halftime.
Immediately after an incomplete pass from quarterback Jimmy Garoppolo on 3rd-and-7 from the Cincinnati 28-yard line, Bengals safety Vonn Bell was called for taunting, giving the 49ers a fresh set of downs.
The 49ers capitalized on the opportunity and scored a touchdown on the first play following the penalty, a touchdown pass from Garoppolo to tight end George Kittle.
Kittle's touchdown was the second scored by the 49ers on Sunday. The first came on a rushing score from wide receiver Deebo Samuel earlier in the second quarter.
With 18 seconds remaining in the half, Kittle's score gave San Francisco a 17-6 lead heading into halftime.