Leukoplakia treatable?

My husband is awaiting a biopsy and is losing sleep over what a diagnosis could mean. He has two white spots in his mouth. He dipped pouches for 10+ years, he stopped a year ago and one of the spots got smaller almost gone while the other didn’t change. Neither is causing any discomfort - he didn’t even know they were there until his dentist recommended he get a biopsy after tracking them for a year but they didn’t seem super concerned. It seemed more like CYA

Obviously they’re not going to say anything until the results come in but how treatable is oral cancer if caught soon enough? Does Leukoplakia instantly mean cancer?