You CAN use a small Brush to apply less Latisse - But Allergan does not Recommend it (want you to)
The OFFICIAL recommendation of Allergan is that you should use one brush PER eyelid one time. Doing anything else deviates from official company recommendations. That being said, a lot of women use smaller brushes to stretch Latisse to two months per kit. And it works just fine.
Be careful about potential cross contamination of the eyelids and change brushes frequently.
To see THE MOST comprehensive page on LATISSE on the Internet, click on the link below -
Dr. P. Aldea...