The invention concerns a device for applying a sealer (S) on an interproximal surface of a tooth (DT) comprising a closed surface (SF), positioning means (AL) for positioning the closed surface (SF) against an interproximal surface of the tooth (DT) to be treated, a sealing agent (AS) designed to be generally positioned between the closed surface (SF) and the interproximal surface and to adhere to the interproximal surface, and maintaining means (F, PMT2, C, EO) for maintaining the closed surface (SF) in position against the interproximal surface while the sealing agent (AS) is cured. The sealing agent (AS), when cured, constitutes at least part of the sealer (S) applied on the interproximal surface. The closed surface (SF) is flexible and designed to match at its periphery the interproximal surface so that the sealing agent (AS), when cured, substantially merges without break with the general surface of the tooth (DT), said general surface comprising the interproximal surface. The closed surface (SF) is designed to provide, when pressed against the interproximal surface, a cavity (FC) designed to receive at least the sealing agent (AS).
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