I underwent tooth cleaning and having burning sensation in gums and palate. Why?

Hello doctor,

Two months ago, I underwent tooth cleaning by a dentist, and they have damaged my gums. Because of this teeth cleaning, I have further symptoms:

I have a burning sensation on the palate and the gums. I am having pressure on my teeth whenever they come in contact with sugar, fruit sugar, and sweeteners.

The gums on my front teeth turned a little brown.

I took Diclofenac (anti-inflammatory) for several days, but there is no improvement.

The gum has covered a little of my front teeth.

There is constant formation of plaque.

The front teeth have become stained.

I have a gland under a tooth on one side. (I do not know if it is related to the rest of the symptoms).

Two days ago, I noticed that the enamel has gone away from the front teeth and also had a mild sore throat and burning sensation.

Also, for five days, I had a small fracture like on the front teeth.

I tried solving my problems with the gum temporarily with the Curaprox Perio Plus mouthwash. For the enamel, I use elmex erosion protection toothpaste and Regenerate mouthwash and they helped a bit.

Other products which I use are:

1. Curodont Protect toothpaste and

2. Curodont Repair.

I went to the dentist to repair the enamel defects and to remineralize in-depth, but the changes are not visible. I am looking forward to your answer.