If you buy products from someone else, you'll want to go through the above list and make sure the product quality. If the whitening gel is packaged into a medicine syringe with a sticker on, it is a strong signal that the quality is not as good as it should be.
Kui sa ostad toote kuskilt mujalt, siis tasuks jälgida kõiki neid ülaltoodud punkte. Juhul kui valgendamise geel on pakendatud kleepsuga süstlasse siis see on märk sellest, et toote kvaliteet ei ole piisavalt hea.