Ordinary silicone sex doll heads are very hard, and the doll’s mouth cannot open, so oral sex is not possible. However, several sex doll brands have now introduced the movable jaw feature. This innovation adds a movable jaw joint to the soft doll’s head , allowing the doll’s mouth to adjust its opening and closing actions. Additionally, features like teeth, a tongue, and uvula are added inside the oral cavity, mimicking the structure of a real human mouth. This makes oral sex easy and provides a more realistic oral experience.