Starting on April 24, 2014, Pentai went on a three fights losing streak, during which he lost his Lumpinee Stadium 112 lbs title against Saknarinnoi Or.Aunsuwan.
[3][4] Pentai broke the losing streak when he faced Sarawut Phithakpabhadang on September 28, 2014, at the Channel 7 Stadium for the 112 lbs belt and a 100,000 baht side-bet.
[5] Penthai became a trainer in 2014, working at Evolve MMA in Singapore and later at Revolution Phuket Gym in Thailand.
On May 13, 2023, he faced Corey Nicholson for the vacant Bantamweight World title.
He lost the fight by knockout in the fourth round.