Yes I'm sure it will help
Dental treatment is great for weight loss
I lost 28lb (actually 35lb but 7 went back on though that was after a 2.5 week holiday and a broken ankle) - I had two teeth our last year and root canal surgery which got infected and a temporary filling for a very long time. I was so scared of the tooth getting infected again or the temp filling falling out and the taste in my mouth was so yuck I didn't eat that much for 6-8 weeks and even after that I was careful about what types of food I ate for a long time.
Do be careful you don't binge on the foods you will struggle to eat with the braces once you have the braces taken out. I went through a binging phase once the crown was finally fitted on my tooth.