You may get some local discomfort and bruising lasting a few days after the treatment. Bruising may be greater in patients who are taking aspirin or any blood thinning medicines. These products should be avoided if possible prior to the injection.
For most areas 3 to 6 months. For treating excessive sweating anything from 1 to 12 months.
No reported cases of an allergic reaction have been reported.

Botox, not painful at all at worst you will feel a tiny pin prick

Fillers, depending on site of injection it ranges from not painful to some discomfort but as we are dentist we can numb the area first with cream or injection if there is a lot of work to be carried out.

The whole process could be over within half an hour.