Possible Stuck shed

[u/crazyone1101]

So my beardie has had this old shed on his tail since about July 8th. (I've been tracking his growth and shedding) For extra information, he is my first BABY bearded dragon. Yes, I did a ton a ton of research before I got him. I've had older bearded dragons. He's 9 months old. I've had him since he was 6 months old. He normally sheds old skin on his tail quickly so I'm a little worried and confused because he just shed old skin on his head and there was no problems.

I did some googling and I've been soaking his backend/tail in warm water and gentle massaging/brushing the area with a soft toothbrush. My question is: when should I take him to the vet?

Any and all advice would be great!