Translucent edges of teeth

Is it common/ normal/ does your toddler have translucent edges on their teeth? Yes my child has been to the dentist and they didn't comment on it but the more I notice especially today after looking closely at this photo the more I'm concerned.

Yes, I'm making another appointment to talk to the dentist. I'm just curious if other parents notice this too with their children or know anything about it.

My child doesn't eat a lot of sugar, brushes with floride toothpaste, drinks almost entirely water etc. Of course I went to Google and one post says it's normal for toddlers and another says it means enamel is eroding....I'm just a worried mom who can't call the dentist until morning...