If the mouth is crooked after collagen fills the lacrimal groove, it is because the nerve is damaged during injection, which leads to muscle paralysis. In this case, they have the right to claim compensation through negotiation, mediation, arbitration or litigation. It is recommended to consult the injector or beauty agency and put forward your questions and requirements. If negotiation fails, we can seek the intervention of a third-party mediation or arbitration institution and seek a fair solution. If the problem remains unresolved, we can consider bringing a lawsuit through legal channels to seek compensation and justice. In this process, it is recommended to keep relevant medical records, photos and evidence to support the claim. If the symptoms are serious, you can also consult a doctor to find out whether there is a choice of drug treatment or acupuncture and physiotherapy for nerve repair.