Dent d'Herens is one of the wilderness and most interesting 4000m Alpine Peaks. Unusual Valpelline Valley opened one of most impressive 6th hours tour through the bottom of this where the civilization expires revealing the wildworld. When you will become to the Place Mulin where the way is starting, you will see your target - Dent d'Herens - from Parking.
The nearest camping in Bionaz but I prefer drive to Lake di Place Moulin where you can pitch the tent on helicopter landing-ground (but early morning your tent can be strong windy tested by helicopter) or try to go on to Prarayer (2005m). There is beautifull and expensive refuge and thousands hectare of mountains meadows.
This photo of Dent d'Herens was taken from a plane (click it to enlarge):