You might be talking about temporomandibular joint disorder (TMJ). Such a scenario can occur when the joint that attaches your jawbone to the skull gets stressed out. Among the symptoms are pain, pressure, and trouble opening your mouth. Teeth grinding, jaw clenching, or arthritis are the causes. To help, start with ice packs, keep a soft diet, exercise your jaw, and take care of the stress you experience.

The uneven teeth may also make some of them look out of the general row or even be completely crooked. The causes for this can be many, some of which are genetics and habits such as thumb sucking. One of them, Braces, is normally used to correct the misalignment of teeth when pressure is applied over time to the teeth to get them in the correct position. Besides making you look straighter, braces can also help with chewing and speaking.

In a situation where your gums are receding, you must visit a periodontist to discover the leading cause of the problem. After solving the main cause, your doctor may discuss implants as a solution for you. 

To get back the enamel you need to Brush regularly using flouridated paste, Intake of calcium rich foods and intake of vitamin D.