Geodesic
On the theory of braid groups
Sbornik. Mathematics, Tome 76 (1993) no. 1, pp. 123-153

Voir la notice de l'article provenant de la source Math-Net.Ru

It is proved that in the braid group $B_n$ for $n\geqslant3$ any proper verbal subgroup $V(B_n)$ defined by a finite set of words $V$ has infinite width relative to $V$. In addition, it is proved that in a colored braid group the taking of roots is unique and that the only element conjugate to its inverse is the identity. 
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V. G. Bardakov. On the theory of braid groups. Sbornik. Mathematics, Tome 76 (1993) no. 1, pp. 123-153. http://geodesic.mathdoc.fr/item/SM_1993_76_1_a6/