Are my bottom teeth receding? (photo)

I've only been to a dentist once which was 7 months ago. My dentist was so shocked because for someone that's never been to a dentist before my teeth were well aligned and healthy. I looked in the mirror today and noticed the bottom of my teeth looks long..googled it and found out they may be receding. I feel like they've always been this way. But I'm not so sure. Would a dentist tell you if your gums seem to be receding?

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