Is it necessary to wear braces because of bruxism?

2 of my teeth are kind of worn out because of my uneven bite and my dentist said he is sure it is because of bruxism, which I'm not entirely convinced I have. He says I'll have to wear braces for at least 2 years but it doesn't seem like the easiest solution to me. Isn't those protector things you use when you sleep the most logical solution for that problem?

I'm kind of suspicious because he recommended me an ortodontist to put on the braces and she has the same last name as him, so I'm assuming it's his wife or sister. Is he trying to make me wear braces so he and his relative can make some cash or something?