IRCT2016042727647N1 IRCT 2016-07-05 Vice Chancellor for research of Shiraz University of Medical Sciences The effect of gain-framed and loss-framed messages on the knowledge and practice of mothers of children under 6 years old in the field of oral health Clinical Trial comparative study of the effect of gain-framed and loss-framed messages on the knowledge and practice of mothers of children under 6 years old in the field of oral health 2016-07-05 anticipated 240 Complete https://irct.ir/trial/22607 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Parallel, Purpose: Prevention, Other design features: The sample will be selected by random cluster sampling. In this case, Shiraz city is divided into two parts of north and south geographical areas. Then 3 center from the list of the kindergartens of the north and 3 centers from the list of the kindergartens of the south will be selected based on simple random sampling. Afterwards, each kindergarten will be allocated to one of the intervention 1, intervention 2 and control groups based on simple random sampling. N/A Dental caries. Intervention 1: Intervention group 1: Thirty gain-framed messages will be sent to the intervention groups 1 during one month. These messages focused on the benefits of compliance of oral hygiene. Intervention 2: Intervention groups 2: Thirty loss-framed messages will be sent to the intervention groups 2 during one month. These messages focused on the disadvantages of non-compliance of oral hygiene. Intervention 3: Control group: The control group did not receive any intervention.