I agree with the consensus here. A car that does not track straight with the road has a rear end problem, not a front end problem. May be failed bushings or collision damage. If it shifts around, doing it more some days than others, or if the steering feels loose, as though the rear tires were low on air, then it is most likely worn-out bushings.
If it is not chewing up the tires or making the steering difficult, it is probably not dangerous or a problem that absolutely must be fixed, but you should find out what it is, so you know whether it is serious or not.
It may be tough to find a mechanic who will be straight with you regarding whether it is something that really needs to be fixed. He wants the business and does not want the responsibility of having told you that it is nothing to worry about.