I have a bad habit where I use my swallowing muscle under my chin to sing higher notes. One of the reasons I believe I keep using the muscle is because before I got serious about singing, I would use my muscle to imitate vibrato. So basically, I would bring my larynx down and up repeatedly using the muscle. I later found out, if I hum very lightly, then the muscle won't come down. My questions are:
1. If I keep doing this will it help me neutralize the muscle?
2. If yes. How long should I do this for? If no, what should I do?
3. Should the muscle move at all or a little?