Tongue sounds belong to the fire pinyin of five elements: D, T, N and L.
Tooth sounds belong to the five elements of wood pinyin: j, q, x and y.
Dental pronunciation belongs to the golden pinyin of five elements: Z, C, S, zh, ch, sh, R.
Laryngeal sounds belong to the five elements of water pinyin: G, K and H.
So l sound and five elements belong to fire.