Hi.. Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concerns.. As per your complain the symptoms of problems associated with left jaw, left nostril and left ear along with leaky dental crown.. Well, your problem seems to be due to sinus infection only that might be leading to ear infection and causing the following symptoms.. I would suggest you to consult an Otolaryngologist and get evaluated and a thorough clinical evaluation and investigations like PNS view x ray or MRI scan and otoscopy or x ray of the ear can help in diagnosis and treatment can be done accordingly.. You can be advised a course of antibiotics, anti-inflammatory painkiller like Ibuprofen, decongestants like Pseudoephadrine, do saline nasal irrigation, steam inhalation and use a humidifier in your room.. You can also be advised decongestant nasal sprays containing Xylometazoline or Oxymetazoline.. Avoid spicy and chilled foods.. Do warm compresses around nostrils.. You can also be given antibiotic and analgesic ear drops.. For leaky crown you should get the crown replaced with an intact and proper fitting crown as a leaky crown can cause secondary infection on the tooth and can cause further decay and even loss of tooth.. Hope this information helps.. Thanks and regards. Dr.Honey Nandwani Arora.