• Floyd Mayweather Jr and Manny Pacquiao

Floyd Mayweather Jr and Manny Pacquiao (Photo : REUTERS/Lucy Nicholson)

Floyd Mayweather Jr. is training hard for his upcoming fight with Manny Pacquiao. Mayweather Jr. is particular about the way he is training, the food he is eating as well the gear he will use during the fight. The fighter is set to wear a diamonds, gold and $100 bills in his mouth.

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According to TMZ, Floyd Mayweather Jr. spends $25,000 per piece to get an expensive mouthpiece crafted by Dr. Lee Gause, a dentist from New York City.

This custom-made mouthpiece is made of gold and diamonds. Dr. Lee Gause flies from New York City to Las Vegas in order to fit the mouthpiece before the star athlete's bouts. He also puts in a $100 bill in the mouthpiece.

TMZ spoke to Mayweather Jr. about his exclusive mouthpiece. He said that he has been in the business for 19 years and he has to smile.

Mayweather Jr. is expected to take home close to $120 million for the much-awaited bout while Pacquiao will earn $80 million.

Meanwhile, Pacquiao's promoter, Bob Arum thinks that if Mayweather Jr. loses the upcoming fight, he will become more popular in the market. According to Arum, Mayweather Jr. will be viewed as "more human."

However, Freddie Roach's point of view is different. "His whole identity is that zero. I don't know how he could come back from a loss," Roach said (via Telegraph).

Elsewhere, Mayweather Jr. has been sharing his training videos with his Instagram followers from time to time.

Floyd Mayweather Jr. vs. Manny Pacquiao pay-per-view happens on Saturday, May 2, 2015.