For an incipient (early) caries lesion on a molar, what is the BEST treatment?

For incipient (non-cavitated) caries in pits and fissures, sealants are the treatment of choice — they physically block bacteria from the lesion. SDF is for cavitated caries, especially in uncooperative patients. Stannous fluoride is preventive. Composite requires tooth preparation for a non-cavitated lesion, which is overtreatment.