You may be experiencing pain from your mouth. There are many causes of this. However it is usually from infection around a tooth or from an irritated nerve in a tooth.
Treatment may range from draining an abscess to starting a root canal therapy. All treatments are carried out using the latest anaesthetics and so your problem will be effectively treated with no discomfort.
The best pain-killers for dental problems are paracetamol and ibuprofen. When taken simultaneously this is very effective. Please read the label first to make sure you are able to take these medications.