Research lab professor.. considered as science LOR??

Hello, So I have worked at a Kinesiology research laboratory for 2 years (5 consecutive semesters and had to quit because the professor retired and the lab didn't need more undergraduate research assistants) and the professor said he will write me a LOR for dental school last May, 2017. He is a Kinesiology professor and most schools do not specify to get a recommendation from a professor that I took class from. Is it okay to submit him as one of science professor LOR? I originally was... Research lab professor.. considered as science LOR??
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