To what extent do dental hygienists (DH) employed by the Public Dental Health Service (PDHS) in Sweden use the new classification system, their knowledge of it and their attitudes towards it. A web-based questionnaire was distributed to DHs in the PDHS in different regions of Sweden. A total of 197 registered DHs responded. The questions covered their knowledge, attitudes and possible barriers to implementation of the new classification system of periodontal and peri-implant diseases, and a question about their perceived need for a complementary digital tool to facilitate its implementation. Seventy per cent of the DHs stated that they used the new classification system. Twenty-nine per cent of the participants were confident in classifying periodontitis under the new system. Furthermore, 36% of the participants considered their knowledge of the new system to be good and 33% to be poor or non-existent. Several DHs stated that the new system was too time-consuming, that it caused stress, that their knowledge was inadequate and that they, therefore, considered it too difficult to use. Eighty per cent of the participants were positive to a digital tool as a complement and support to classify periodontitis and peri-implantitis. The present study showed that most of the DHs used the new classification system and one-third considered their knowledge to be good, although it was difficult and time-consuming. Furthermore, in general, the DHs were positive to a digital tool to facilitate application of the new classification system.