My 1.5 year old twins like to bite each other whenever they fight over anything resulting in many bite marks. It might be teething but they have teethers already. How can I stop this behavior?

I do agree with Mummy Jaslyn. Educating your child that biting is not right. My child kept pulling my hair thinking it was fun so I pulled hers to let her feel pain and I asked "do you like it when mummy pulls your hair?", "do you like it?" and ended off with "cannot make people upset and cause pain". I kept repeating for a couple of times when she did it to me and finally gotten into her it is wrong to do that. Maybe you wanna try biting your twins? Else put them at naughty corner if they do it again after you telling them for the third consecutive time.