No but you have to take care after use. There are hard acrylic gels that should be washed after 10-12 hrs
Generally no. If you are really concerned about a particular new brand or type of product, you could go ahead and try a different brand, but that’s probably not it. It’s mostly genetic, you can try rogaine. I have seen weather, climate, and stress accelerate things — when a friend did a year of grad school on the East coast, he came back bald. But if you’re really concerned, try rogaine or rogaine+finasteride.
Avoid pulling on your hair when you’re styling it and you should be fine.
No.