Perbandingan efek pemutih gigi pada jus buah alpukat (Persea americana), apel (Malus domestica), mangga (Mangifera indica), nanas (Ananas comosus), dan pisang (Musa acuminata) = The comparative effects of teeth whitening in avocado fruit juice (Persea americana), apple (Malus domestica), manggo (Mangifera indica), pineapple (Ananas comosus) and banana (Musa acuminata) / Wulan Meiliana Permatasari