This issue has been going on for many, many years. it feels like my first premolar's bottom edges are like razors and every now and then they will attract my tongue and lip, annoying them for a week.

Ouch!: I know the feeling. Your dentist may have some advice, possibly suggesting assistance through an orthodontist it tooth positioning or angulation may help.

Adjusting: Your dentist may be able to lightly smooth down the edges so that they don't seem too pointy as well. I do not recommend doing any sort of work with any of your power tools at home. It will take your dentist maybe three minutes and your tongue will be free of the incessant annoyance.

Need adjustment: Have your dentist adjust the biting surfaces of your premolars that are too pointy.

Consult your dentist: Consult your dentist.The dentist may smoothe the area of the tooth or suggest a restoration or other treatment.

Razors: If you mean the edge by the gum line, then you may have either erosion of the tooth due to some external stimulus, or an abfraction which is loss of enamel due to the forces of trauma, as in grinding or clenching. If it is only the premolars then this may be more likely. If it is the biting edge then grinding may be your problem. See a dentist to evaluate your situation and for treatment.

Polish them: You can polish the edges to make them smoother.