Infections in oral and maxillofacial surgery are a very common complication, about 11% of all surgical procedures in Brazil. There are some steps to prevent and treat oral and maxillofacial surgery infections. In this paper, we introduce a new material to deal with these complications. Protective DAC hydrogel is made of hyaluronic acid and poly-L-lactic acid plus antibiotic and antibiofilm agents. This hydrogel is useful where implants are installed like prosthesis or stable internal fixation, mainly in cases when a second surgical step is needed, because of an infection, mainly in cases of biofilm infection over internal fixation plates and/or screws. A case is reported here to exemplify one of the utilities of this new product. The use of protective hydrogel is very useful in oral and maxillofacial surgery, not only for prevention but also in cases of replacement of infected implants due to biofilm or any other source of infection.