Caries among children 1–4 years in Indonesia was 10.4%. Maintenance of dental and oral health among under five children and kindergarten depent on their mothers. Mother's knowledge on dental and oral health maintenance is lack. The study aimed to determine the correlation of maternal knowledge, attitude, and behaviour behavior on maintenance of dental and oral health to their children dental and oral health status. It was an observational study with a cross sectional design. The study was conducted to kindergarden in Kelurahan Kemayoran, Surabaya city. There were 73 mothers and 73 of their children recruited. The independent variables were knowledge, attitude, and practice of mothers on maintenance of dental and oral health and the dependent variables was their children dental and oral health status. Data were collected by interview and the dental and oral health status by intra-oral dental examination. Analysis was by Spearmen correlation test. The majority of mothers were aged 30-39 years old, middle education, with Rp.1,000,000,- to Rp.2,000,000,- monthly income. For their children were relatively higher girls and 78.1% with bad dental and oral health status. The knowledge of mothers on maintenamce dental and oral health was not correlated to their children dental and health status possibly the lowest (30.1%) mothers knowledge on bruishing teeth conducted together with their children. Meanwhile, the mother attitute was correlated (r = 0.272) to their children dental and health status, ρ = 0.01. It was as more than half of mothers very agree that their children should brush their teeth twice a day. The behaviour of mothers on maintenance dental and oral health was not correalated as none of caries teeth was patched. Primary Health Centers should enhance education on the right knowledge on maintenance of dental and oral hygiene of children, especially among mothers.