Mini-implants, which are placed temporarily in the bone between the roots of the teeth to provide extra anchorage in orthodontics, do not cause allergic reactions in the body. They are made of a biologically inert material.
The problems you can expect after having one of these implants placed are:
1. Mild, dull pain for a few hours after the procedure;
2. Possible irritation of the cheek and a sore or mouth ulcer;
3. Inflammation of the gum around the head of the mini-implant;
4. Loosening of the mini-implant, which means it has to be repositioned;
5. Shifting of the mini-implant as a result of it loosening;
6. The mini-implant falling out.
None of these unwanted effects causes a lasting problem or major discomfort for the patient. Mini-implants are a completely safe aid for moving teeth.
This answer is for general information. Your own case needs an examination by an orthodontist.