First tooth?

Sarah

I know it doesn’t really matter since it’s mostly for my own record keeping, but what day do you consider when baby got their first tooth? My son has been teething for a while and I have been feeling his gums regularly to monitor the process. Yesterday it switched from feeling like just a hard bump to feeling the sharp edge of the tooth, but I still can’t really see it because it’s not sticking up from the gums yet. Would the day he gets his first tooth be the first day you can see a white tooth or the day you can feel it cutting through?