The ontario law
"Termination for cause, reasonable enjoyment
64. (1) A landlord may give a tenant notice of termination of the tenancy if the conduct of the tenant, another occupant of the rental unit or a person permitted in the residential complex by the tenant is such that it substantially interferes with the reasonable enjoyment of the residential complex for all usual purposes by the landlord or another tenant or substantially interferes with another lawful right, privilege or interest of the landlord or another tenant.
Notice
(2) A notice of termination under subsection (1) shall,
(a) provide a termination date not earlier than the 20th day after the notice is given;
(b) set out the grounds for termination; and
(c) require the tenant, within seven days, to stop the conduct or activity or correct the omission set out in the notice.
Notice void if tenant complies
(3) The notice of termination under subsection (1) is void if the tenant, within seven days after receiving the notice, stops the conduct or activity or corrects the omission. 1997, c. 24, s. 64."