Jaylen Brown 's prayers have been answered -- hair companies are lining up to work with the Boston Celtics superstar ... just a few days after he was apparently caught painting his hairline. Dr. Christine Shaver of Bernstein Medical tells TMZ Sports she saw Brown's Twitch stream earlier this week ... when he faced the music and admitted it might be time to get some help. Brown went as far as to say he was considering a hair transplant in Turkey ... but Dr. Shaver said she'd be delighted to keep