The present invention exhibits exceptional removability of excess adhesive and exceptional cuttability of a cured product obtained by curing the adhesive. An orthodontic adhesive containing: 250-750 parts by mass of a filler (A), the filler (A) containing 10-35 mass% of an inorganic filler component (A1) which comprises particles of spherical or substantially spherical shape and has an average primary particle size of 0.07-0.6 μm and 65-90 mass% of a filler component (A2) having an average particle size of 0.7-35 μm； 100 parts by mass of a polymerizable monomer (B)； and 0.01-10 parts by mass of a polymerization initiator (C), 60 mass% or more of the filler component (A2) in the orthodontic adhesive being a filler component (A3) comprising particles having a Vickers hardness HV of less than 750, as well as an orthodontic adhesive kit using the orthodontic adhesive.
