On 6/15/23 an EE was replacing a ripper tooth on a CAT dozer. The EE used a sledgehammer to dislodge the ripper tooth and upon impact a roughly 1/4-1/2"" piece of the tooth broke off and struck the EE in the left calf. On 6/16/23 EE was taken to the clinic where an x-ray confirmed the object was lodged in their calf. EE was prescribed antibiotics.