3-year-old baby sucking function is better, but also after the teething period, if drooling is still very serious, more considered oral diseases, facial nerve palsy, congenital dementia and other causes, need to go to the hospital for examination, clear causes after treatment. 1, oral diseases: such as oral ulcers, herpes pharyngitis, ulcers, inflammation for strong stimulation, will promote saliva secretion, resulting in 3-year-old baby drooling is still very serious. Oral ulcers can follow medical advice to be localized to pediatric open throat sword spray, watermelon cream spray, if necessary, submucosal injection of methylprednisolone suspension, but not recommended for long-term use, herpetic pharyngitis is generally self-limiting, if more serious oral local spray interferon spray for anti-infective treatment; 2, facial nerve palsy: mostly due to facial cold, in addition to the performance of 3-year-old baby drooling, also accompanied by mastoid and In addition to manifesting as drooling of the face, it is also accompanied by pain behind the mastoid process and ears, distorted eyes and mouth, etc. If conservative treatment is not effective for 3 months, acupuncture, electrotherapy, surgery can be taken; 3, congenital dementia: mostly manifested as intellectual defects, pronunciation defects, inattention, frequent drooling and other symptoms, need to go to the hospital to improve the cranial CT, EEG, intelligence test and other examinations to clarify the cause of the treatment, can After 3 years old baby drooling, need to dry in time, or bib, but pay attention to the number of changes, pay attention to the light diet, so as not to aggravate the stimulation.