How bad was my exposure in school?

So I recently watched Chernobyl on HBO, which really got me think about radiation in general again. Then I remembered an incident in school (about 13-14 years ago) where we were experimenting with these radioactive plastic sticks ( with Alpha, beta and Gamma radiation) and I remember in my "im a badass and think nothing can hurt me" years (thankfully grew out of those) that I took the one with Gamma radiation ( Cs-137 370 kBq (Found the one on the internet)) and pointed it close to my open mouth for a few seconds, to show I wasn't afraid of Radiation.

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Now Chernobyl got me thinking, did I expose my soft tissue in my mouth to these dangerous sources and will that mean that I get some kind of damage down the road? The sticks in questions: https://shop.skolebutik.dk/shop/risoekilder-3-stk-4791p.html

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Edit: Yes I know it was stupid to fuck around with radioactive materials, but alas my younger self was stupid stupid kid in that regard.