Trigeminal neuralgia can make it very difficult to maintain good oral hygiene, especially when the pain experienced is in the teeth. It can commonly lead to sufferers avoiding the area during their hygiene regime. Sufferers may cease to have regular dental check-ups altogether.
Decay is the breakdown of tooth tissue from acids produced by bacteria. Acids can only be produced when you eat carbohydrates (sugars!). Decay leads to cavities (holes) forming in the teeth which can cause toothache and exacerbate pain from TN in that area.
Gum disease (gingivitis and periodontitis) occurs when bacteria stagnate below the gum surface. It can lead to bone loss, inflamed and bleeding gums, loose teeth and discomfort.