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.
The total cost for professionally replacing airbags that deployed in a collision can be $1,000-$6,000 or more but averages about $3,000-$5,000, depending on the year, make and model of vehicle; the number and location of the air bags; and the related parts that need replacing, such as the electronic control unit (also called the airbag computer or diagnostic unit), sensors, springs, the instrument panel, the dashboard, the windshield or the steering wheel.