Hi, I hope you are well, brushing before and after oral sex only reduces a certain amount of bacteria, but oral sex is certainly not the only cause of throat or mouth cancer, there are several predisposing factors such as genetics as well as drugs, alcohol and tobacco use, high risk HPV that can lead to malignant lesions.

In particular, I would recommend that if you can have oral sex, only with the proper prevention such as the use of a latex barrier and if you have only one faithful partner. Thank you for your comment and I hope it has helped 🤗 @bhoa