INDICATOR AND DENTAL INSTRUMENT HAVING INDICATOR

An indicator (10, 60) and a dental instrument (100) having the indicator (10, 60), the indicator (10, 60) being used for the dental instrument (100). In one embodiment, the indicator (10) comprises a first indicator (20) and a second indicator (30) which are stacked, the first indicator (20) comprising a first pattern layer (21), and the second indicator (30) comprising a second pattern layer (31). An active substance in the oral cavity sequentially permeates through the first indicator (20) and the second indicator (30), and with the permeation of the active substance in the oral cavity, the first pattern layer (21) and the second pattern layer (31) sequentially display patterns. In another embodiment, the indicator (10) comprises an adsorption layer (11) and a display layer (12), and when the adsorption layer (11) adsorbs an active substance in the oral cavity and reaches a saturated state, the active substance permeates through the adsorption layer (11) and into the display layer (12), and the active subst