The clinical manifestation of dental fluorosis is characterized by chalky to brownish plaques on the enamel that erupted during the same period, and in severe cases, it is complicated by parenchymal defects in the enamel. Clinically, it is often categorized into chalky (mild), stained (moderate) and defective (severe) types according to its mild, moderate and severe degrees. The following examinations can be done: 1, pulp temperature test Normal pulp does not feel pain on water close to the mouth temperature of 20 to 50 ℃, cold water of 10 to 20 ℃ and hot water of 50 to 60 ℃ seldom cause pain, so it is lower than l0 ℃ for cold stimulation, and higher than 60 ℃ for hot stimulation. When the pulp is diseased, it may show sensitivity or retardation to hot and cold stimuli, and its diagnostic value is relative due to a number of pseudo-responses that may occur. It is necessary to measure the control tooth first, and then measure the affected tooth, and must be combined with other examination results to make a comprehensive judgment. Whether cold diagnosis method or hot diagnosis method, the test site should be in the lip or buccal surface of the teeth in the middle 1/3, because the enamel is more complete, causing a comparable reaction. 2, dental pulp electric vitality determination Normal dental pulp induction of electric current can be different due to different teeth, healthy teeth have a transient numbness, stinging, pain on the current stimulation. Measurement of pulpal electrical activity has diagnostic significance for pulpal diseases. Acute pulpitis is particularly sensitive to electrical stimulation, chronic pulpitis is sluggish, pulp degeneration is very low response, dead pulp can be no response.