Some medicines, tricyclic antidepressants and antimalarials can also cause darkening of your gums The nastiest is the effect of acute necrotising periodontitis (sometimes known as trench mouth) which is advanced gum disease and the black colour is the result of dead tissue
The cost of replacing an airbag outright can be several hundred dollars, although it once again depends partially upon the exact make and model of the car that you're working with. Expect to pay on the order of $1000 to $1500 per airbag to be replaced. Number 3 -- Airbag Resetting. If you've been in an accident, and the airbags themselves have become deployed, you'll have to set them back up in order to be able to drive again.
Neither IIHS nor AAA recommend that owners replace undeployed airbags on older-model cars. A bigger concern, they say, is if airbags deploy in a crash, they should be replaced with parts directly from the manufacturer, and not with a used airbag. We recommend they get the OEM equipment when possible, Nolan said.