1: Alcohol reduces healing of tissue surrounding dental implants
2: Affects coagulation of the blood
3: Heavy use of alcohol could have direct effect on the failure of dental implants, including mouthwash with alcohol as an ingredient.
4: Tissue around the implants is more inflamed
For the above reasons please be honest with your dentist if you are a heavy user or drinker of alcohol.
If your alcohol intake is heavy, it is possible that your dentist may opt not do the implant procedure.