An 18-year-old girl came to a dentist to check the quality of fissure sealing that had been performed one year ago. Objectively: the sealant is completely retained in the 17, 16, 26, 27, 37, and 47. No sealant was detected in the 36 and 46, in the distal longitudinal fissures of these teeth there is softened enamel. Fedorov-Volodkina Hygiene Index is 2,5. What tactics regarding the 36 and 46 should the dentist choose in this case?