Influence of soaking 30% and 50% baking soda (sodium bicarbonate) solution for 5, 10, and 15 days towards tooth dicolorisation - Fatmasari, Diyah; Dosen Jurusan Keperawatan Gigi Poltekkes Poltekkes Kemenkes Semarang (Jurusan Keperawatan Gigi, Poltekkes Kemenkes Semarang, 2014)