4. 水果美白法（續）
另外，菠蘿或能有助美白牙齒。研究指比起一般牙膏，如果牙膏中含有菠蘿蛋白酶（菠蘿中的一種酶），能更有效去除牙漬。[5]但注意，尚未證實進食菠蘿能擁有同樣效果。
參考文獻：
[1] Peedikayil, F. C., Sreenivasan, P., & Narayanan, A. (2015). Effect of coconut oil in plaque related gingivitis—a preliminary report. Nigerian medical journal: journal of the Nigeria Medical Association, 56(2), 143.
[2] Kleber, C. J., Moore, M. H., & Nelson, B. J. (1998). Laboratory assessment of tooth whitening by sodium bicarbonate dentifrices. The Journal of clinical dentistry, 9(3), 72-75.
[3] Zheng, L. W., Li, D. Z., Lu, J. Z., Hu, W., Chen, D., & Zhou, X. D. (2014). Effects of vinegar on tooth bleaching and dental hard tissues in vitro. Sichuan da xue xue bao. Yi xue ban= Journal of Sichuan University. Medical science edition, 45(6), 933-6.
[4] Kwon, S. R., Meharry, M., Oyoyo, U., & Li, Y. (2015). Efficacy of do-it-yourself whitening as compared to conventional tooth whitening modalities: an in vitro study. Operative dentistry, 40(1), E21-E27.
[5] Chakravarthy, P. K., & Acharya, S. (2012). Efficacy of extrinsic stain removal by novel dentifrice containing papain and bromelain extracts. Journal of young pharmacists: JYP, 4(4), 245.
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