Girls, we're drinking vigantoil... We've been drinking it for six months…

Girls, we're drinking vigantoil... We've been drinking it for six months now. And I'm only just thinking about whether I'm doing it right. I drip a drop on the pacifier and give the baby to suck on for at least five minutes, then only allow them to spit it out. Is that okay? Does he get anything in his mouth? Because I can't imagine putting a drop in his mouth. And how much do you guys use? We have a 5ml bottle and we give one drop per day. Honestly, I don't remember if I gave it every day or not for two to five months... half of the bottle is left now... I'm thinking... was