Can I have braces again if I've had them twice already?

First is when I was in hs and second on my college. I had braces for a year each. And wear retainers then since I have impacted wisdom teeth I stop wearing them. And they are now remove. And now my lower teeth have gap so I went to dentist and told me that I need braces again. Is that possible? And he told me that I need up and down, And it worries me that since I have craze lines on my front teeth will they crack if I have braces again?the dentist told me that my teeth are kinda thin. Thank you

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