Men head Hair remove

What is the most effective ways to get rid of unwanted hair ( hair removal ) :
- laser hair removal : less sessions , less perminant , cover big areas 
- electrolysis hair removal : more sessions , more perminant , cover small areas 
How long does those methods lasts :
- laser treatment : up to 6 months , and may get perminant after repeating the treatment everywhile 
- electrolysis treatment : mostly perminant , but its a slow process , and need longer period to finish big and hair areas
Possible treatment side effects :
1. simple skin burns 
2. pain during session
3. not complete hair removal 
4. skin irriration 
General advices :
1. consider consult a dermatologist first before start looking for medical treatment and follow doctor instructions 
2. take care of your body skin before and after the sessions 
3. pay attention to personal hygine 
4. if any side effects appeared after the session , reconsult your doctor , and if the side effects presist , considering change the treatment center or stoping it to avoid skin problem
5. if you have any related problem to hairy skin such as boils or reddness , consult dermatolist first and treat your skin issues