Abutment screw can be placed in implant body as per requirement and can be removed if needed any number of times but without damaging threadings of implant body.

 first of all dentist will try to find out what is the main cause for such a huge gap. The etiological problem should be diagnosed and then followed by fixed Orthodontic Braces treatment by an orthodontist.

Its an ugly duckling stage, dentist can analyze the situation better if picture is shared, most of such cases resolved by the time canine erupts.

Apthous ulcer is mainly due to stress ;constipation and vitamin b complex deficiency. The following problems should be addressed and by its treatment. Vitamin n b complex Syrup 15 ml minimum for a period of one month one time daily. Mucopain gel thrice daily before having on ulcer site or as prescribed by Dentist.

To stop cavity from spreading, you can use flouridated pastes, Dental sealants and rinse after every meal.

Visit your dentist and get it filled with cement

For restoration you can either go for cosmetic filling or root canal procedure along with crown .Filling takes 1 day and root canal takes one week.

After dental implant you can Ice cream, smoothies, mashed potatoes, any soft and liquid diet.

For periodontal disease grafting with flap surgery is the best treatment.

Wisdom teeth usually needs surgical removal when it is impacted and is not getting enough space to erupt. As you have pain since 9 days ,you need to visit a dentist so can prescribe antibiotics and analgesics . But for time being can go for over the counter pain relief medicine like ibuprofen.

i would require a dental opg & a cbct(3d xray) of the full month to evaluate my treatment plan.

cost of each implant is around 50k plus cap, depending on which implant you choose 

You can protect the enamel by cutting off sugary diet, limiting the use of fruit juices and stopping having aerated drinks.

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

Depends on the severity , if any of your teeth are very mobile , dentist will check the teeth and later decide if they may have to be extracted or can be treated to save your teeth.

Periodontal scaling n root planing is one complete treatment, and it is important to stop further spread of the disease