Category ratings defined. Test instruments are rated on their ability to withstand a voltage spike, which is applied through a specified level of resistance (Table). The ratings are broken down by categories â CAT I, II, III, and IV.
Burning Mouth and Tongue. Burning tongue is an odd sensation in the tongue and mouth that most commonly affects women who are entering or going through menopause. Though researchers are not sure what causes it, several suspects include irritating dentures, nerve damage, or hormonal imbalances.
Some researchers also have suggested dysfunction. in the nerves supplying the mouth and tongue as a. possible cause. Strictly speaking, the term. âburning mouth syndromeâ should be used only. when a definite cause has not been found. Once burning mouth syndrome begins, it may. persist for many years.