Restricted mouth opening can be caused by tooth extraction, trauma, temporomandibular joint dysfunction, etc. Recovery time is mainly determined by the specific cause. 1. Tooth extraction: The process of tooth extraction can lead to destruction of periodontal membrane, which can cause obvious inflammatory reaction, resulting in restriction of mouth opening. In this case, active anti-inflammatory treatment, limited mouth opening can be recovered in 1~2 weeks. 2. Trauma: The recovery time for trauma-induced mouth opening is mainly determined by the degree of injury. For minor injuries, it usually takes about 1 week to recover. Severe injuries such as bone fracture often require several months to recover. 3. Mandibular joint dysfunction: Mandibular joint dysfunction is divided into episodic and remission periods, and the remission period usually does not lead to mouth opening restriction. In remission period, it usually does not lead to mouth opening restriction, while in flare-up period, the jaw joint will lead to mouth opening restriction due to wear and tear, inflammation stimulation and other reasons. The exacerbation period usually lasts for 1 to 2 weeks, and in severe cases, it may last for about a month before recovery. In the case of limited mouth opening, you need to go to the regular hospital in time for relevant examination and treatment in order to make the condition recover quickly.