The sound of bones rattling when the mouth is opened is mainly due to the temporomandibular joints in the lower wall of the external auditory canal, which can be caused by temporomandibular joint disorders or minor dislocations. Avoid eating hard and spicy food, and do not open your mouth widely or misalign your bite, which can cause temporomandibular joint disorders. For the last 1-2 months consider eating semi-soft foods such as porridge or noodles. If there is pain in the temporomandibular joint, you can use hot water bag to apply warm compresses and take pain relieving medicines such as ibuprofen capsule or pain and blood circulation capsule for symptomatic treatment.